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Massive star-forming regions exhibit an extremely rich and diverse chemistry,which in principle provides a wealth of molecular probes, as well aslaboratories for interstellar prebiotic chemistry. Since the chemical structureof these sources displays substantial spatial variation among species on smallscales (${\lesssim}10^4$ au), high angular resolution observations are neededto connect chemical structures to local environments and inform astrochemicalmodels of massive star formation. To address this, we present ALMA 1.3 mmobservations toward OB cluster-forming region G10.6-0.4 (hereafter "G10.6") ata resolution of 0.14$^{\prime\prime}$ (700 au). We find highly-structuredemission from complex organic molecules (COMs) throughout the central 20,000au, including two hot molecular cores and several shells or filaments. Wepresent spatially-resolved rotational temperature and column density maps for alarge sample of COMs and warm gas tracers. These maps reveal a range of gassubstructure in both O- and N-bearing species. We identify several spatialcorrelations that can be explained by existing models of COM formation,including NH$_2$CHO/HNCO and CH$_3$OCHO/CH$_3$OCH$_3$, but also observeunexpected distributions and correlations which suggest that our currentunderstanding of COM formation is far from complete. Importantly, complexchemistry is observed throughout G10.6, rather than being confined to hotcores. The COM composition appears to be different in the cores compared to themore extended structures, which illustrates the importance of high spatialresolution observations of molecular gas in elucidating the physical andchemical processes associated with massive star formation.

Sub-arcsecond Imaging of the Complex Organic Chemistry in Massive Star-forming Region G10.6-0.4