Related literature {#sec1}
==================

For the crystal structures of similar 2-methyl-3-phenyl­sulfonyl-1-benzofuran compounds, see: Choi *et al.* (2008*a* [@bb3],*b* [@bb4]).

Experimental {#sec2}
============

 {#sec2.1}

### Crystal data {#sec2.1.1}

C~18~H~18~O~3~S*M* *~r~* = 314.38Monoclinic,*a* = 7.2712 (9) Å*b* = 17.583 (2) Å*c* = 12.788 (2) Åβ = 102.669 (2)°*V* = 1595.1 (4) Å^3^*Z* = 4Mo *K*α radiationμ = 0.21 mm^−1^*T* = 173 (2) K0.40 × 0.40 × 0.30 mm

### Data collection {#sec2.1.2}

Bruker SMART CCD diffractometerAbsorption correction: none8966 measured reflections3125 independent reflections2606 reflections with *I* \> 2σ(*I*)*R* ~int~ = 0.053

### Refinement {#sec2.1.3}

*R*\[*F* ^2^ \> 2σ(*F* ^2^)\] = 0.045*wR*(*F* ^2^) = 0.135*S* = 1.123125 reflections200 parametersH-atom parameters constrainedΔρ~max~ = 0.36 e Å^−3^Δρ~min~ = −0.37 e Å^−3^

 {#d5e464}

Data collection: *SMART* (Bruker, 2001[@bb2]); cell refinement: *SAINT* (Bruker, 2001[@bb2]); data reduction: *SAINT*; program(s) used to solve structure: *SHELXS97* (Sheldrick, 2008[@bb6]); program(s) used to refine structure: *SHELXL97* (Sheldrick, 2008[@bb6]); molecular graphics: *ORTEP-3* (Farrugia, 1997[@bb5]) and *DIAMOND* (Brandenburg, 1998[@bb1]); software used to prepare material for publication: *SHELXL97*.

Supplementary Material
======================

Crystal structure: contains datablocks global, I. DOI: [10.1107/S1600536808025786/gw2046sup1.cif](http://dx.doi.org/10.1107/S1600536808025786/gw2046sup1.cif)

Structure factors: contains datablocks I. DOI: [10.1107/S1600536808025786/gw2046Isup2.hkl](http://dx.doi.org/10.1107/S1600536808025786/gw2046Isup2.hkl)

Additional supplementary materials: [crystallographic information](http://scripts.iucr.org/cgi-bin/sendsupfiles?gw2046&file=gw2046sup0.html&mime=text/html); [3D view](http://scripts.iucr.org/cgi-bin/sendcif?gw2046sup1&Qmime=cif); [checkCIF report](http://scripts.iucr.org/cgi-bin/paper?gw2046&checkcif=yes)

Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: [GW2046](http://scripts.iucr.org/cgi-bin/sendsup?gw2046)).

Comment
=======

This work is related to our communications on the synthesis and structure of 2-methyl-3-phenylsulfonyl-1-benzofuran analogues, *viz*. 5-ethyl-2-methyl-3-phenylsulfonyl-1-benzofuran (Choi *et al.*, 2008*a*) and 5-isopropyl-2-methyl-3-phenylsulfonyl-1-benzofuran (Choi *et al.*, 2008*b*). Here we report the crystal structure of the title compound, 2-methyl-3-phenylsulfonyl-5-propyl-1-benzofuran (Fig. 1).

The benzofuran unit is almost planar, with a mean deviation of 0.018 (2) Å from the least-squares plane defined by the nine constituent atoms. The phenyl ring (C9--C14) makes a dihedral angle of 81.74 (6)° with the plane of the benzofuran fragment. The crystal packing (Fig. 2) is stabilized by intermolecular C---H···π interactions between a methyl H atom and the phenyl ring of the phenylsulfonyl substituent, with a C18---H18C···*Cg*^ii^ separation of 3.291 (4) Å (Fig. 2 and Table 1; *Cg* is the centroid of the C9--C14 phenyl ring, symmetry code as in Fig. 2). The molecular packing is further stabilized by intermolecular C---H···O interactions (Fig. 2 and Table 1; symmetry code as in Fig. 2).

Experimental {#experimental}
============

77% 3-Chloroperoxybenzoic acid (471 mg, 2.1 mmol) was added in small portions to a stirred solution of 2-methyl-3-phenylsulfanyl-5-propyl-1-benzofuran (282 mg, 1.0 mmol) in dichloromethane (30 ml) at 273 K. After being stirred for 4 h at room temperature, the mixture was washed with saturated sodium bicarbonate solution and the organic layer was separated, dried over magnesium sulfate, filtered and concentrated under vacuum. The residue was purified by column chromatography (hexane-ethyl acetate, 2:1 *v*/*v*) to afford the title compound as a colorless solid \[yield 83%, m.p. 388--389 K; *R*~f~ = 0.75 (hexane--ethyl acetate, 2:1 *v*/*v*)\]. Single crystals suitable for X-ray diffraction were prepared by evaporation of a solution of the title compound in acetone at room temperature. Spectroscopic analysis: ^1^H NMR (CDCl~3~, 400 MHz) δ 0.94 (t, J = 7.32 Hz, 3H), 1.62--1.69 (m, 2H), 2,68 (t,J = 7.32 Hz, 2H), 2.79 (s, 3H), 7.12 (d, J = 8.44 Hz, 1H), 7.31 (d, J = 8.44 Hz, 1H), 7.48--7.60 (m, 3H), 7.67 (s, 1H), 8.01 (d, J = 8.44 Hz, 2H); EI-MS 314 \[*M*^+^\].

Refinement {#refinement}
==========

All H atoms were positioned geometrically and refined using a riding model, with C---H = 0.95 Å for aromatic H atoms, 0.99 Å for the methylene H atoms, and 0.98 Å for methyl H atoms, respectively, and with *U*~iso~(H) = 1.2Ueq(C) for aromatic and methylene H atoms, and *U*~iso~(H) = 1.5Ueq(C) for methyl H atoms.

Figures
=======

![The molecular structure of the title compound, showing displacement ellipsoids drawn at the 50% probability level.](e-64-o1761-fig1){#Fap1}

![C---H···π and C---H···O interactions (dotted lines) in the title compound. Cg denotes the ring centroid. \[Symmetry code: (i) x + 1, y, z; (ii) x + 1/2, -y + 3/2, 1/2 + z+1/2; (iii) x - 1, y, z; (iv) x - 1/2, -y + 3/2, z + 1/2.\]](e-64-o1761-fig2){#Fap2}

Crystal data {#tablewrapcrystaldatalong}
============

  ------------------------- ---------------------------------------
  C~18~H~18~O~3~S           *F*~000~ = 664
  *M~r~* = 314.38           *D*~x~ = 1.309 Mg m^−3^
  Monoclinic, *P*2~1~/*n*   Mo *K*α radiation λ = 0.71073 Å
  Hall symbol: -P_2yn       Cell parameters from 3769 reflections
  *a* = 7.2712 (9) Å        θ = 2.4--28.3º
  *b* = 17.583 (2) Å        µ = 0.21 mm^−1^
  *c* = 12.788 (2) Å        *T* = 173 (2) K
  β = 102.669 (2)º          Block, colourless
  *V* = 1595.1 (4) Å^3^     0.40 × 0.40 × 0.30 mm
  *Z* = 4                   
  ------------------------- ---------------------------------------

Data collection {#tablewrapdatacollectionlong}
===============

  ------------------------------------------ --------------------------------------
  Bruker SMART CCD diffractometer            3125 independent reflections
  Radiation source: fine-focus sealed tube   2606 reflections with *I* \> 2σ(*I*)
  Monochromator: graphite                    *R*~int~ = 0.053
  Detector resolution: 10.0 pixels mm^-1^    θ~max~ = 26.0º
  *T* = 173(2) K                             θ~min~ = 2.0º
  φ and ω scans                              *h* = −8→5
  Absorption correction: none                *k* = −21→21
  8966 measured reflections                  *l* = −13→15
  ------------------------------------------ --------------------------------------

Refinement {#tablewraprefinementdatalong}
==========

  ---------------------------------------------------------------- ---------------------------------------------------------------------------------------------------
  Refinement on *F*^2^                                             Secondary atom site location: difference Fourier map
  Least-squares matrix: full                                       Hydrogen site location: inferred from neighbouring sites
  *R*\[*F*^2^ \> 2σ(*F*^2^)\] = 0.045                              H-atom parameters constrained
  *wR*(*F*^2^) = 0.135                                               *w* = 1/\[σ^2^(*F*~o~^2^) + (0.0731*P*)^2^ + 0.5558*P*\] where *P* = (*F*~o~^2^ + 2*F*~c~^2^)/3
  *S* = 1.12                                                       (Δ/σ)~max~ = 0.001
  3125 reflections                                                 Δρ~max~ = 0.36 e Å^−3^
  200 parameters                                                   Δρ~min~ = −0.37 e Å^−3^
  Primary atom site location: structure-invariant direct methods   Extinction correction: none
  ---------------------------------------------------------------- ---------------------------------------------------------------------------------------------------

Special details {#specialdetails}
===============

  -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  Geometry. All e.s.d.\'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.\'s are taken into account individually in the estimation of e.s.d.\'s in distances, angles and torsion angles; correlations between e.s.d.\'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.\'s is used for estimating e.s.d.\'s involving l.s. planes.
  Refinement. Refinement of *F*^2^ against ALL reflections. The weighted *R*-factor *wR* and goodness of fit *S* are based on *F*^2^, conventional *R*-factors *R* are based on *F*, with *F* set to zero for negative *F*^2^. The threshold expression of *F*^2^ \> σ(*F*^2^) is used only for calculating *R*-factors(gt) *etc*. and is not relevant to the choice of reflections for refinement. *R*-factors based on *F*^2^ are statistically about twice as large as those based on *F*, and *R*- factors based on ALL data will be even larger.
  -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å^2^) {#tablewrapcoords}
==================================================================================================

  ------ ------------- -------------- -------------- -------------------- --
         *x*           *y*            *z*            *U*~iso~\*/*U*~eq~   
  S      0.61553 (7)   0.71791 (3)    0.30885 (4)    0.02750 (18)         
  O1     0.7452 (2)    0.52071 (8)    0.44838 (12)   0.0335 (4)           
  O2     0.7324 (2)    0.76700 (8)    0.38556 (12)   0.0367 (4)           
  O3     0.4196 (2)    0.73668 (9)    0.27128 (12)   0.0359 (4)           
  C1     0.6276 (3)    0.62641 (11)   0.36076 (15)   0.0258 (4)           
  C2     0.4937 (3)    0.56569 (11)   0.32516 (16)   0.0266 (4)           
  C3     0.3214 (3)    0.55783 (13)   0.25182 (16)   0.0310 (5)           
  H3     0.2625        0.6007         0.2131         0.037\*              
  C4     0.2374 (3)    0.48657 (13)   0.23632 (17)   0.0347 (5)           
  C5     0.3257 (3)    0.42403 (13)   0.29533 (19)   0.0403 (6)           
  H5     0.2669        0.3756         0.2839         0.048\*              
  C6     0.4948 (3)    0.43051 (12)   0.36937 (19)   0.0380 (5)           
  H6     0.5528        0.3880         0.4094         0.046\*              
  C7     0.5749 (3)    0.50211 (12)   0.38205 (16)   0.0300 (5)           
  C8     0.7750 (3)    0.59641 (12)   0.43314 (16)   0.0304 (5)           
  C9     0.7172 (3)    0.71003 (11)   0.19608 (16)   0.0276 (4)           
  C10    0.6070 (3)    0.68438 (12)   0.09947 (17)   0.0327 (5)           
  H10    0.4781        0.6717         0.0939         0.039\*              
  C11    0.6880 (4)    0.67762 (13)   0.01194 (18)   0.0403 (6)           
  H11    0.6144        0.6603         −0.0546        0.048\*              
  C12    0.8757 (4)    0.69593 (13)   0.0204 (2)     0.0407 (6)           
  H12    0.9304        0.6910         −0.0402        0.049\*              
  C13    0.9842 (3)    0.72143 (13)   0.1167 (2)     0.0393 (5)           
  H13    1.1129        0.7341         0.1218         0.047\*              
  C14    0.9063 (3)    0.72851 (12)   0.20576 (18)   0.0339 (5)           
  H14    0.9804        0.7457         0.2722         0.041\*              
  C15    0.0537 (3)    0.47675 (16)   0.1550 (2)     0.0445 (6)           
  H15A   0.0473        0.5158         0.0986         0.053\*              
  H15B   0.0549        0.4264         0.1205         0.053\*              
  C16    −0.1198 (4)   0.4823 (2)     0.1979 (2)     0.0575 (8)           
  H16A   −0.1251       0.5334         0.2296         0.069\*              
  H16B   −0.1129       0.4444         0.2558         0.069\*              
  C17    −0.2983 (3)   0.46938 (15)   0.1141 (2)     0.0463 (6)           
  H17A   −0.2957       0.4185         0.0833         0.056\*              
  H17B   −0.3080       0.5076         0.0573         0.056\*              
  H17C   −0.4074       0.4737         0.1472         0.056\*              
  C18    0.9566 (3)    0.62697 (14)   0.4949 (2)     0.0458 (6)           
  H18A   1.0596        0.6087         0.4633         0.069\*              
  H18B   0.9770        0.6097         0.5695         0.069\*              
  H18C   0.9532        0.6827         0.4929         0.069\*              
  ------ ------------- -------------- -------------- -------------------- --

Atomic displacement parameters (Å^2^) {#tablewrapadps}
=====================================

  ----- ------------- ------------- ------------- -------------- -------------- ---------------
        *U*^11^       *U*^22^       *U*^33^       *U*^12^        *U*^13^        *U*^23^
  S     0.0294 (3)    0.0218 (3)    0.0307 (3)    0.00328 (19)   0.0053 (2)     −0.00131 (19)
  O1    0.0344 (8)    0.0271 (7)    0.0364 (8)    0.0002 (6)     0.0022 (6)     0.0050 (6)
  O2    0.0446 (9)    0.0263 (7)    0.0377 (8)    −0.0017 (7)    0.0059 (7)     −0.0062 (6)
  O3    0.0323 (9)    0.0338 (8)    0.0409 (9)    0.0094 (7)     0.0069 (7)     0.0003 (7)
  C1    0.0277 (10)   0.0236 (9)    0.0264 (10)   0.0004 (8)     0.0063 (8)     −0.0003 (8)
  C2    0.0277 (10)   0.0266 (10)   0.0274 (10)   −0.0005 (8)    0.0099 (8)     −0.0029 (8)
  C3    0.0278 (11)   0.0360 (11)   0.0302 (11)   0.0009 (9)     0.0088 (8)     −0.0021 (9)
  C4    0.0314 (12)   0.0418 (12)   0.0340 (11)   −0.0063 (9)    0.0143 (9)     −0.0110 (9)
  C5    0.0435 (14)   0.0326 (11)   0.0490 (14)   −0.0125 (10)   0.0193 (11)    −0.0104 (10)
  C6    0.0452 (14)   0.0271 (11)   0.0440 (13)   −0.0023 (10)   0.0148 (11)    0.0019 (9)
  C7    0.0314 (11)   0.0293 (10)   0.0302 (10)   −0.0010 (8)    0.0088 (9)     −0.0002 (8)
  C8    0.0327 (11)   0.0259 (10)   0.0312 (10)   0.0002 (9)     0.0042 (9)     0.0008 (8)
  C9    0.0314 (11)   0.0202 (9)    0.0309 (11)   0.0037 (8)     0.0065 (8)     0.0043 (8)
  C10   0.0315 (11)   0.0325 (11)   0.0327 (11)   −0.0003 (9)    0.0040 (9)     0.0041 (9)
  C11   0.0518 (15)   0.0368 (12)   0.0314 (11)   −0.0026 (11)   0.0074 (10)    0.0025 (9)
  C12   0.0534 (15)   0.0316 (11)   0.0427 (13)   0.0031 (11)    0.0228 (11)    0.0062 (10)
  C13   0.0343 (12)   0.0323 (11)   0.0545 (14)   0.0007 (9)     0.0165 (11)    0.0067 (10)
  C14   0.0324 (12)   0.0280 (10)   0.0399 (12)   −0.0006 (9)    0.0045 (9)     0.0018 (9)
  C15   0.0374 (13)   0.0589 (15)   0.0392 (13)   −0.0113 (11)   0.0130 (10)    −0.0187 (11)
  C16   0.0352 (14)   0.096 (2)     0.0409 (14)   0.0089 (14)    0.0068 (11)    −0.0107 (14)
  C17   0.0322 (13)   0.0517 (15)   0.0532 (15)   0.0029 (11)    0.0057 (11)    −0.0032 (12)
  C18   0.0391 (13)   0.0368 (12)   0.0523 (14)   −0.0034 (10)   −0.0103 (11)   0.0062 (11)
  ----- ------------- ------------- ------------- -------------- -------------- ---------------

Geometric parameters (Å, °) {#tablewrapgeomlong}
===========================

  -------------------- -------------- ----------------------- --------------
  S---O2               1.437 (2)      C10---C11               1.380 (3)
  S---O3               1.438 (2)      C10---H10               0.9500
  S---C1               1.735 (2)      C11---C12               1.384 (4)
  S---C9               1.765 (2)      C11---H11               0.9500
  O1---C8              1.369 (2)      C12---C13               1.384 (4)
  O1---C7              1.378 (3)      C12---H12               0.9500
  C1---C8              1.360 (3)      C13---C14               1.384 (3)
  C1---C2              1.449 (3)      C13---H13               0.9500
  C2---C7              1.392 (3)      C14---H14               0.9500
  C2---C3              1.398 (3)      C15---C16               1.485 (4)
  C3---C4              1.389 (3)      C15---H15A              0.9900
  C3---H3              0.9500         C15---H15B              0.9900
  C4---C5              1.407 (3)      C16---C17               1.508 (3)
  C4---C15             1.512 (3)      C16---H16A              0.9900
  C5---C6              1.382 (3)      C16---H16B              0.9900
  C5---H5              0.9500         C17---H17A              0.9800
  C6---C7              1.382 (3)      C17---H17B              0.9800
  C6---H6              0.9500         C17---H17C              0.9800
  C8---C18             1.483 (3)      C18---H18A              0.9800
  C9---C14             1.391 (3)      C18---H18B              0.9800
  C9---C10             1.392 (3)      C18---H18C              0.9800
                                                              
  O2---S---O3          118.98 (9)     C10---C11---C12         120.4 (2)
  O2---S---C1          108.86 (9)     C10---C11---H11         119.8
  O3---S---C1          107.68 (10)    C12---C11---H11         119.8
  O2---S---C9          108.30 (10)    C13---C12---C11         120.4 (2)
  O3---S---C9          107.87 (9)     C13---C12---H12         119.8
  C1---S---C9          104.17 (9)     C11---C12---H12         119.8
  C8---O1---C7         106.97 (15)    C12---C13---C14         120.3 (2)
  C8---C1---C2         107.64 (18)    C12---C13---H13         119.8
  C8---C1---S          125.89 (16)    C14---C13---H13         119.8
  C2---C1---S          126.07 (15)    C13---C14---C9          118.7 (2)
  C7---C2---C3         119.09 (19)    C13---C14---H14         120.6
  C7---C2---C1         104.40 (18)    C9---C14---H14          120.6
  C3---C2---C1         136.49 (19)    C16---C15---C4          115.6 (2)
  C4---C3---C2         119.1 (2)      C16---C15---H15A        108.4
  C4---C3---H3         120.4          C4---C15---H15A         108.4
  C2---C3---H3         120.4          C16---C15---H15B        108.4
  C3---C4---C5         119.6 (2)      C4---C15---H15B         108.4
  C3---C4---C15        119.7 (2)      H15A---C15---H15B       107.4
  C5---C4---C15        120.7 (2)      C15---C16---C17         113.4 (2)
  C6---C5---C4         122.4 (2)      C15---C16---H16A        108.9
  C6---C5---H5         118.8          C17---C16---H16A        108.9
  C4---C5---H5         118.8          C15---C16---H16B        108.9
  C7---C6---C5         116.4 (2)      C17---C16---H16B        108.9
  C7---C6---H6         121.8          H16A---C16---H16B       107.7
  C5---C6---H6         121.8          C16---C17---H17A        109.5
  O1---C7---C6         126.0 (2)      C16---C17---H17B        109.5
  O1---C7---C2         110.60 (18)    H17A---C17---H17B       109.5
  C6---C7---C2         123.4 (2)      C16---C17---H17C        109.5
  C1---C8---O1         110.39 (18)    H17A---C17---H17C       109.5
  C1---C8---C18        134.4 (2)      H17B---C17---H17C       109.5
  O1---C8---C18        115.24 (18)    C8---C18---H18A         109.5
  C14---C9---C10       121.3 (2)      C8---C18---H18B         109.5
  C14---C9---S         119.47 (16)    H18A---C18---H18B       109.5
  C10---C9---S         119.19 (17)    C8---C18---H18C         109.5
  C11---C10---C9       118.9 (2)      H18A---C18---H18C       109.5
  C11---C10---H10      120.6          H18B---C18---H18C       109.5
  C9---C10---H10       120.6                                  
                                                              
  O2---S---C1---C8     −27.3 (2)      C1---C2---C7---C6       −177.9 (2)
  O3---S---C1---C8     −157.57 (18)   C2---C1---C8---O1       −0.9 (2)
  C9---S---C1---C8     88.1 (2)       S---C1---C8---O1        −173.94 (14)
  O2---S---C1---C2     160.91 (17)    C2---C1---C8---C18      177.5 (2)
  O3---S---C1---C2     30.7 (2)       S---C1---C8---C18       4.4 (4)
  C9---S---C1---C2     −83.72 (19)    C7---O1---C8---C1       1.0 (2)
  C8---C1---C2---C7    0.4 (2)        C7---O1---C8---C18      −177.68 (19)
  S---C1---C2---C7     173.44 (15)    O2---S---C9---C14       19.23 (19)
  C8---C1---C2---C3    −177.8 (2)     O3---S---C9---C14       149.23 (16)
  S---C1---C2---C3     −4.7 (3)       C1---S---C9---C14       −96.53 (17)
  C7---C2---C3---C4    −1.1 (3)       O2---S---C9---C10       −161.66 (16)
  C1---C2---C3---C4    176.9 (2)      O3---S---C9---C10       −31.66 (18)
  C2---C3---C4---C5    0.7 (3)        C1---S---C9---C10       82.58 (17)
  C2---C3---C4---C15   −178.30 (18)   C14---C9---C10---C11    −0.2 (3)
  C3---C4---C5---C6    0.1 (3)        S---C9---C10---C11      −179.34 (16)
  C15---C4---C5---C6   179.2 (2)      C9---C10---C11---C12    0.1 (3)
  C4---C5---C6---C7    −0.6 (3)       C10---C11---C12---C13   −0.2 (3)
  C8---O1---C7---C6    177.3 (2)      C11---C12---C13---C14   0.3 (3)
  C8---O1---C7---C2    −0.7 (2)       C12---C13---C14---C9    −0.4 (3)
  C5---C6---C7---O1    −177.6 (2)     C10---C9---C14---C13    0.4 (3)
  C5---C6---C7---C2    0.2 (3)        S---C9---C14---C13      179.49 (16)
  C3---C2---C7---O1    178.77 (17)    C3---C4---C15---C16     −94.1 (3)
  C1---C2---C7---O1    0.2 (2)        C5---C4---C15---C16     86.9 (3)
  C3---C2---C7---C6    0.6 (3)        C4---C15---C16---C17    −178.0 (2)
  -------------------- -------------- ----------------------- --------------

Hydrogen-bond geometry (Å, °) {#tablewraphbondslong}
=============================

  --------------------- --------- --------- ----------- ---------------
  *D*---H···*A*         *D*---H   H···*A*   *D*···*A*   *D*---H···*A*
  C13---H13···O3^i^     0.95      2.60      3.355 (3)   137
  C18---H18C···Cg^ii^   0.98      3.29      3.947 (4)   126
  --------------------- --------- --------- ----------- ---------------

Symmetry codes: (i) *x*+1, *y*, *z*; (ii) *x*+1/2, −*y*+3/2, *z*+1/2.

###### Hydrogen-bond geometry (Å, °)

*Cg* is the centroid of the C9--C14 phenyl ring.

  *D*---H⋯*A*             *D*---H   H⋯*A*   *D*⋯*A*     *D*---H⋯*A*
  ----------------------- --------- ------- ----------- -------------
  C13---H13⋯O3^i^         0.95      2.60    3.355 (3)   137
  C18---H18*C*⋯*Cg*^ii^   0.98      3.29    3.947 (4)   126

Symmetry codes: (i) ; (ii) .
