Chemistry of the organic-rich hot core G327.3-0.6

We present gas-phase abundances of species found in the organic-rich hot co re G327.3-0.6. The data were taken with the Swedish-ESO Submillimetre Teles cope (SEST). The 1-3 mm spectrum of this source is dominated by emission fe atures of nitrile species and saturated organics, with abundances greater t han those found in many other hot cores, including Sgr B2 and OMC-1. Popula tion diagram analysis indicates that many species etc.) have hot components that originate (CH3CN, C2H3CN, C2H5CN, CH3OH, in a compact (similar to2") region. Gas-phase chemical models cannot reproduce the high abundances of t hese molecules found in hot cores, and we suggest that they originate from processing and evaporation of icy grain mantle material. In addition, we re port the first detection of vibrationally excited ethyl cyanide and the fir st detection of methyl mercaptan (CH3SH) outside the Galactic center.