(4R)-4-羟基-L-脯氨酸乙酯

ethyl 1-diethoxymethyl-1H-pyrrole-2-carboxylate

carbon monoxide

ethyl 2-(((E)-3-((2-ethoxy-2-oxoethyl)amino)allylidene)amino)acetate hydrochloride

ethyl 3-bromo-2-hydroxyiminopropanoate