2-Methyl-2-butenolide;2-Methylbut-2-en-4-olide; 3-Methyl-2(5H)-furanone;4-Hydroxy-2-methyl-2-butenoic acid lactone; 4-Hydroxy-2-methyl-2-butenoic acid g-lactone; a-Methyl-g-crotonolactone
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