CAS 1609-00-3 appears in our catalog under these names: 1–Methylbiguanide, N-Methylimidodicarbonimidic diamide, 95%, 95%, Metformin impurity 11, 95.0%, 1-[(diaminomethylidene)amino]-N-methylmethanimidamide, 95%, Metformin EP Impurity E. Offered by: GLPBio, Chemat, MedChemExpress, Fluorochem, Chemat Brand. Available pack sizes: 1g, 250mg, 50mg, 5g, Get quote, on request.