10080-68-9
4-hydroxycrotonic acid ethyl ester
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10479-85-3
4-氯巴豆酸乙酯
37746-78-4
4-溴巴豆酸乙酯
24587-49-3
4-羟基-2-丁烯酸
64559-17-7
5-oxa-nona-2,7-dienedioic acid
38090-53-8
(E)-4-氨基-2-丁烯酸