  Massive young stellar objects (MYSOs) with hot cores are classic sources of
complex organic molecules. The origins of these molecules in such sources, as
well as the small- and large-scale differentiation between nitrogen- and
oxygen-bearing complex species, are poorly understood.
  We aim to use complex molecule abundances toward a chemically less explored
class of MYSOs with weak hot organic emission lines to constrain the impact of
hot molecular cores and initial ice conditions on the chemical composition
toward MYSOs.
  We use the IRAM 30m and the Submillimeter Array to search for complex organic
molecules over 8-16 GHz in the 1~mm atmospheric window toward three MYSOs with
known ice abundances, but without luminous molecular hot cores.
  Complex molecules are detected toward all three sources at comparable
abundances with respect to CH$_3$OH to classical hot core sources. The relative
importance of CH$_3$CHO, CH$_3$CCH, CH$_3$OCH$_3$, CH$_3$CN, and HNCO differ
between the organic-poor MYSOs and hot cores, however. Furthermore, the
N-bearing molecules are generally concentrated toward the source centers, while
most O- and C-bearing molecules are present both in the center and in the
colder envelope. Gas-phase HNCO/CH$_3$OH ratios are tentatively correlated with
the ratios of NH$_3$ ice over CH$_3$OH ice in the same lines of sight, which is
consistent with new gas-grain model predictions.
  Hot cores are not required to form complex organic molecules, and source
temperature and initial ice composition both seem to affect complex organic
distributions toward MYSOs. To quantify the relative impact of temperature and
initial conditions requires, however, a larger spatially resolved survey of
MYSOs with ice detections.
