Ondansetron Standard

1,2,3,4-Tetrahydro-9-methyl-3-[(2-methyl-1H-imidazol-1-yl)methyl]-9H-carbazol-4-one; GR 38032; GR 38032X; Ondanles; Setron; Yatrox; Zofran; Zophren; Zudan; (±)-2,3-Dihydro-9-methyl-3-[(2-methylimidazol-1-yl)methyl]carbazol-4(1H )-one; 4H -Carbazol-4-one, 1,2,3,9-tetrahydro-9-methyl-3-[(2-methyl-1H -imidazol-1-yl)methyl]- (±)- (USP);