Table : Prompt C Template I The author of the manuscript determined the unknown to be dibutyl oxylate for Prompt C, which has a molecular weight of 202.25 g/mol and would likely produce 29 ethyl cation and 41 propyl cation m/z fragments. The IR C=O stretch 1735 wavenumber was identified as an ester. Molecular symmetry was observed from four types of proton integrating to 4:4:4:6 from 3 symmetric pairs of CH2 groups, and 1 symmetric methyl. The splitting pattern from the most downfield CH2 was a doublet of doublets due to immediate proximity to the oxygen, with each proton of its CH2 neighbor causing a doublet, seen in Figure .