4-bromo-6,8-dimethyl-9-cyano-4a,10a-cis-4,4a-trans-1,2,3,4,4a,10a-hexahydrobenzothiazolo[3,2-a]pyridinium tribromide

一氯丙酮

双乙烯酮

N-溴代丁二酰亚胺

1-methylvinyl oxide ion