2,6-(Dibrommethyl)-4-oxo-4H-pyran-3,5-dicarbonsaeure-diethylester

2,3-二溴异丁酸

醋酸镍(四水)

2,6-dimethyl-4-thioxo-4H-pyran-3,5-dicarboxylic acid diethyl ester

2-甲基丙氨酸