Cimetidine : 2-Cyano-1-methyl-3-[2-[[(5-methyl-1H-imidazol-4-yl)methyl]sulfanyl]ethyl]guanidine ;2-Cyano-1-methyl-3-[2-[[(5-methylimidazol-4-yl)methyl]thio]ethyl]guanidine ;
Cimetidine EP Impurity F : 2-Cyano-1,3-bis[2-[[(5-methyl-1H-imidazol-4-yl)methyl]sulfanyl]ethyl]guanidine ; Cimetidine bis Impurity ;