ethyl 2-acetamido-2-(ethoxycarbonyl)-4-pentenoate

甲醇

rac-4-oxo-1,2-pyrrolidinedicarboxylic acid diethyl ester

水

6-bromomethyl-2-methyl-5,6-dihydro-[1,3]oxazine-4,4-dicarboxylic acid diethyl ester, hydrobromide