5-methyl-2-((5-methyl-1H-imidazol-4-yl)methyl)-2,5-dihydro-1H-pyrido[4,3-b]indol-1-one; 2,5-Dihydro-5-methyl-2-[(4-methyl-1H-imidazol-5-yl)methyl]-1H-pyrido[4,3-b]indol-1-one; 2,5-Dihydro-5-methyl-2-[(5-methyl-1H-imidazol-4-yl)methyl]-1H-pyrido[4,3-b]indol-1-one; Alosetron 3,4-Didehydro Impurity
