89303-64-0 AY-28,228 Atiprosin maleate Atiprosin maleate [USAN] Pyrazino(2',3':3,4)pyrido(1,2-a)indole, 1-ethyl-1,2,3,4,4a,5,6,12b-octahydro-12-methyl-4-(1-methylethyl)-, trans, (z)-2-butenedioate(1:1)