Give possible structure with IR and NMR

20. Give a possible structure for the compound with the following molecular formula, IR, and 1H NMR. Molecular Formula: C4H8O2 Remember your "steps" a) calculate the degree of unsaturation b) Check the IR for the "type" of functional group (ester or acid) c) check the NMR for "ker" peaks d) draw the main functional group(s) and then add carbons as needed