Losartan potassium Imp. M (EP): [2-butyl-1-[[2?-[2-[[2-butyl-4-chloro-1-[[2?-(1H-tetrazol-5-yl)biphenyl-4-yl]methyl]-1H-imidazol-5-yl]methyl]-2H-tetrazol-5-yl]biphenyl-4-yl]methyl]-4-chloro-1H-imidazol-5-yl]methanol.