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Exact mass analysis of an unknown compound containing only C, H, O, and N atoms gives M+ = 131.0946. Determine the correct formula for this compound; use the "rule of 13" and substitute in O's and N's to generate the possible formulas (ie do not simply use online software to do this problem). Determine the number of double-bond equivalents (dbe) for the formula and propose a possible structure.

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