1H-Carbazole, 2,3,4,9-tetrahydro-8-methoxy-9-(2-(1-piperidinyl)ethyl)-, (E)-2-butenedioate (1:1) 2,3,4,9-Tetrahydro-8-methoxy-9-(2-(1-piperidinyl)ethyl)-1H-carbazole (E)-2-butenedioate (1:1) 49558-40-9