N-Desaminosulfonyl-N-cyano Famotidine;Famotidine cyanoamidine, N-Cyano-3-[[2-(diaminomethyleneamino)thiazol-4-yl]methylthio]propanimidamide; (USP);3-[[[2-[(Aminoiminomethyl)amino]-4-thiazolyl]methyl]thio]-N-cyanopropanimidamide;Famotidine EP Impurity G;Famotidine Impurity G;