1-Pyrrolidineethanol, alpha-(1,2,3,5,6,7-hexahydro-s-indacen-4-yl)-, (Z)-2-butenedioate (1:1) 67367-90-2 VUFB-10610 alpha-(1,2,3,5,6,7-Hexahydro-s-indacen-4-yl)-1-pyrrolidineethanol maleate