  In the aim of completing our previous efforts devoted to local and Rydberg
transitions in organic compounds, we provide a series of highly-accurate
vertical transition energies for intramolecular charge-transfer transitions
occurring in ($\pi$-conjugated) molecular compounds. To this end we apply a
composite protocol consisting of linear-response CCSDT excitation energies
determined with Dunning's double-$\zeta$ basis set corrected by CC3/CCSDT-3
energies obtained with the corresponding triple-$\zeta$ basis. Further basis
set corrections (up to \emph{aug}-cc-pVQZ) are obtained at the CCSD and CC2
level. We report 30 transitions obtained in 17 compounds. These reference
values are then used to benchmark a series of wave function (CIS(D), SOPPA,
RPA(D), EOM-MP2, CC2, CCSD, CCSD(T)(a)*, CCSDR(3), CCSDT-3, CC3, ADC(2),
ADC(3), and ADC(2.5)), the Green's function-based Bethe-Salpeter equation (BSE)
formalism performed on top of the partially self-consistent ev$GW$ scheme
considering two different starting points (BSE/ev$GW$@HF and BSE/ev$GW$@PBE0),
and TD-DFT combined with several exchange-correlation functionals (B3LYP, PBE0,
M06-2X, CAM-B3LYP, LC-$\omega$HPBE, $\omega$B97X, $\omega$B97X-D, and M11).
