1H-Indole, 4-(1-propyl-3-piperidinyl)-, (E)-2-butenedioate (2:1) 4-(1-Propyl-3-piperidinyl)-1H-indole (E)-2-butenedioate (2:1) 4-(1-Propylpiperidin-3-yl)-1H-indole fumarate (2:1) 83363-37-5