3a-bromo-5,6-dihydroxy-4,11b-dimethoxy-11-methyl-(3a
r,11b
c)-3a,11b-dihydro-[1,3]dioxolo[4,5-
c]acridinium; bromide 在
sodium tetrahydroborate 、
hydroxide 作用下,
生成
5-hydroxy-4,11b-dimethoxy-11-methyl-(3ar,11bc)-3a,11b-dihydro-11H-[1,3]dioxolo[4,5-c]acridin-6-one