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The relative column densities of the structural isomers methyl formate,glycolaldehyde, and acetic acid are derived for a dozen positions towards themassive star-forming regions MM1 and MM2 in the NGC 6334I complex, which areseparated by $\sim$4000 AU. Relative column densities of these molecules arealso gathered from the literature for 13 other star-forming regions. In thiscombined dataset, a clear bi-modal distribution is observed in the relativecolumn densities of glycolaldehyde and methyl formate. No such distribution isevident with acetic acid. The two trends are comprised of star-forming regionswith a variety of masses, suggesting that there must be some other commonparameter that is heavily impacting the formation of glycolaldehyde. This isindicative of some demonstrable differentiation in these cores; studying theabundances of these isomers may provide a clue as to the integral chemicalprocesses ongoing in a variety of protostellar environments.

Interstellar Glycolaldehyde, Methyl Formate, and Acetic Acid I: A Bi-modal Abundance Pattern in Star Forming Regions