6-(4-Acetamidophenyl)-1,2,3,4,4a,10b-hexahydro-8,9-dimethoxy-2-methylbenzo(c)(1,6)-naphthyridine-bis(hydrogen maleate) 76166-55-7 AH 21-132 AH 21132 Acetamide, N-(4-(1,2,3,4,4a,10b-hexahydro-8,9-dimethoxy-2-methylbenzo(c)(1,6)naphthyridin-6-yl)phenyl)-, cis-, (Z)-2-butenedioate (1:2)