5-Methoxy-12,14-dimethyl-16-sulfanylidene-1,8,10-triazatetracyclo[7.7.0.0^{2,7}.0^{10,15}]hexadeca-2,4,6,8,11,14-hexaen-13-one

8(9)-methoxy-1,3-dimethyl-12-thioxopyrido[1',2':3,4]imidazo[1,2-a]benzimidazol-2-(12h)-one (mixture of regioisomers) ; 8-methoxy-1,3-dimethyl-12-thioxobenzo[4',5']imidazo[2',1':2,3]imidazo[1,5-a]pyridin-2(12h)-one ; omeprazole impurity (mixture of regioisomers) ; omeprazole impurity-f (ep) ; pyrido[1',2':3,4]imidazo[1,2-a] benzimidazol-2(12h)-one, 8- methoxy-1,3-dimethyl-12-thioxo- ; 8-methoxy-1,3-dimethyl-12-thioxo-pyrido[123,4]imidazo[1,2-a]benzimidazol-2-(12h)-one ; omeprazole ep impurity f ; 9-methoxy-1,3-dimethyl-12-thioxobenzo[4',5']imidazo[2',1':2,3]imidazo[1,5-a]pyridin-2(12h)-one ; omeprazole impurity f