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We present the results of a line identification analysis using data from theIRAM Plateau de Bure Inferferometer, focusing on six massive star-forming hotcores: G31.41+0.31, G29.96-0.02, G19.61-0.23, G10.62-0.38, G24.78+0.08A1 andG24.78+0.08A2. We identify several transitions of vibrationally excited methylformate (HCOOCH$_3$) for the first time in these objects as well as transitionsof other complex molecules, including ethyl cyanide (C$_2$H$_5$CN), andisocyanic acid (HNCO). We also postulate a detection of one transition ofglycolaldehyde (CH$_2$(OH)CHO) in two new hot cores. We find G29.96-0.02,G19.61-0.23, G24.78+0.08A1 and 24.78+0.08A2 to be chemically very similar.G31.41+0.31, however, is chemically different: it manifests a larger chemicalinventory and has significantly larger column densities. We suggest that it mayrepresent a different evolutionary stage to the other hot cores in the sample,or it may surround a star with a higher mass. We derive column densities formethyl formate in G31.41+0.31, using the rotation diagram method, of$\times$10$^{17}$ cm$^{-2}$ and a T$_{rot}$ of $\sim$170 K. For G29.96-0.02,G24.78+0.08A1 and G24.78+0.08A2, glycolaldehyde, methyl formate and methylcyanide all seem to trace the same material and peak at roughly the sameposition towards the dust emission peak. For G31.41+0.31, however,glycolaldehyde shows a different distribution to methyl formate and methylcyanide and seems to trace the densest, most compact inner part of hot cores.

A high resolution study of complex organic molecules in hot cores