2-羟基-3-苯基丙基氨基甲酸叔丁酯

methyl 4-benzyl-9-(benzyloxy)-1,8-dioxo-1,3,4,8-tetrahydro-2H-pyrido[1,2-a]pyrazine-7-carboxylate

methyl 4-benzyl-9-(benzyloxy)-2-ethyl-1,8-dioxo-1,3,4,8-tetrahydro-2H-pyrido[1,2-a]pyrazine-7-carboxylate

4-benzyl-2-ethyl-9-hydroxy-1,8-dioxo-1,3,4,8-tetrahydro-2H-pyrido[1,2-a]pyrazine-7-carboxylic acid