2-pentenoic acid, 4-oxo-, methyl ester, (2E)-;2-Pentenoic acid, 4-oxo-, methyl ester, (E)-;Methyl (2E)-4-oxo-2-pentenoate;Methyl (2E)-4-oxopent-2-enoate;Methyl 4-oxo-2-pentenoate
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