4-甲酰基-1H-吡咯-2-甲酸乙酯

5-Methyl-6-phenoxy-5,6-dihydro-4H-[1,2]oxazine-3-carboxylic acid ethyl ester

吡咯-2-羧酸乙酯

ethyl 3-bromo-2-hydroxyiminopropanoate

ethyl 3-hydroxy-4-methyl-1-tosylpyrrolidine-2-carboxylate