Metformin EP Impurity B Catalogue M422572 CAS 4405-08-7 M.W 168.16 M.F C4H8N8 Specifications FAQs Synonyms: 1-(4,6-diamino-1,3,5-triazin-2-yl)guanidineCAS No.: 4405-08-7;2959-04-8(HCl salt);3553-49-9(HNO3 salt)