4-吗啉丙酸甲酯

methyl 3-[(4-methylphenyl)sulfonylamino]propanoate

5-methoxycarbonyl-pyrazoline-3-carboxylic acid methyl ester

氯乙酸甲酯

dimethyl 1-(2-methoxy-2-oxoethyl)-4,5-dihydro-1H-pyrazole-3,5-dicarboxylate