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Keywords: 5837-72-9 OR Methyl 4-oxo-2-butenoate OR Methyl (2E)-4-oxo-2-butenoate OR Methyl (2E)-4-oxobut-2-enoate OR Fumaraldehydic Acid Methyl Ester OR 2-Butenoic acid, 4-oxo-, methyl ester, (E)- OR 2-Butenoic acid, 4-oxo-, methyl ester, (2E)-
