2,3,4,9-Tetrahydro-1H-carbazol-5-ol; 5-Hydroxy-2,3,4,9-tetrahydrocarbazole; 6,7,8,9-TETRAHYDRO-5H-CARBAZOL-4-OL; 5-Hydroxy-1,2,3,4-tetrahydrocarbazole;