ETHYL TRANS-3-METHYL-4-OXO-2-BUTENOATE;ETHYL TRANS-GAMMA-OXOSENECIOATE;ETHYL 3-METHYL-4-OXOCROTONATE;ethyl trans-γ-oxosenecioate;Ethyl trans-γ-oxosenecioate, Ethyl trans-3-methyl-4-oxo-2-butenoate
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