1H-Indole, 4-(1,2,5,6-tetrahydro-3-pyridinyl)-, ethanedioate (2:1) 4-(1,2,5,6-Tetrahydro-3-pyridinyl)-1H-indole ethanedioate (2:1) 4-(1,2,5,6-Tetrahydropyridin-3-yl)-1H-indole oxalate 83367-91-3