Synonyms : 1,2,3,4-Tetrahydro-9-methylcarbazol-4-one; 1,2,3,9-Tetrahydro-4H-9-methyl-carbazole-4-one; CAS No.:27387-31-1 Molecular formula: C13H13NO Content: ≥98% Use : Inetrmediate of Ondansetron HCl