Synonyms: Ondansetron Hydrochloride Dihydrate Imp. A (EP), Ondansetron Imp. A (EP), Ondansetron USP Related Compound A, Ondansetron USP RC A, (3RS)-3-(Dimethylamino)methyl-9-methyl-1,2,3,9-tetrahydro-4H-carbazol-4-one Hydrochloride, Ondansetron Hydrochloride Dihydrate Imp. A (EP) as Hydrochloride, 3-[(Dimethylamino)methyl]-1,2,3,9-tetrahydro-9-methyl-4H-carbazol-4-one monohydrochloride, GR 37896A, BP Ondansetron Impurity A, Ph Eur Ondansetron Impurity A, USP Ondanestron Related Compound A, ondansetron mannich compound (GR 37896A), Ondansetron Related Compound A as Hydrochloride, Ondansetron Hydrochloride Dihydrate Impurity A as Hydrochloride, Ondansetron Impurity A as Hydrochloride