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Comparison of their chemical compositions shows, to first order, a goodagreement between the cometary and interstellar abundances. However, a complexO-bearing organic molecule, ethylene glycol (CH$_{2}$OH)$_{2}$, seems to departfrom this correlation because it was not easily detected in the interstellarmedium although it proved to be rather abundant with respect to other O-bearingspecies in comet Hale-Bopp. Ethylene glycol thus appears, together with therelated molecules glycolaldehyde CH$_{2}$OHCHO and ethanol CH$_{3}$CH$_{2}$OH,as a key species in the comparison of interstellar and cometary ices as well asin any discussion on the formation of cometary matter. We focus here on theanalysis of ethylene glycol in the nearest and best studied hot core-likeregion, Orion-KL. We use ALMA interferometric data because high spatialresolution observations allow us to reduce the line confusion problem withrespect to single-dish observations since different molecules are expected toexhibit different spatial distributions. Furthermore, a large spectralbandwidth is needed because many individual transitions are required tosecurely detect large organic molecules. Confusion and continuum subtractionare major issues and have been handled with care. We have detected the aGg'conformer of ethylene glycol in Orion-KL. The emission is compact and peakstowards the Hot Core close to the main continuum peak, about 2" to thesouth-west; this distribution is notably different from other O-bearingspecies. Assuming optically thin lines and local thermodynamic equilibrium, wederive a rotational temperature of 145 K and a column density of 4.6 10$^{15}$cm$^{-2}$. The limit on the column density of the gGg' conformer is five timeslower.

Antifreeze in the hot core of Orion - First detection of ethylene glycol in Orion-KL