3-甲基-2-丁烯酸乙酯

ethyl 2-hydroxy-3-methylbut-3-enoate

3-甲基-2-氧代丁酰乙酯

3-phenyl-5-propan-2-ylidene-2-sulfanylidene-1,3-thiazolidin-4-one

alpha,beta-二羟基异戊酸