短语词组短語butenoic c acid 丁烯酸Butenoic acid isobutyl ester 乙烯基乙酸異丁酯3 -Butenoic acid isobutyl ester 乙烯基乙酸異丁酯2 -Butenoic acid ethyl ester 丁烯酸乙酯-butenoic acid 丁烯酸trans -2-butenoic acid 反式methoxy -2-Butenoic acid 甲氧基丁烯酸 返回 butenoic acid