CAS 13183-79-4 appears in our catalog under these names: Cefoperazone Impurity 3（Cefoperazone EP Impurity C）, 5-Mercapto-1-methyltetrazole, 98% . Offered by: Hubei YoungXin, Thermo Scientific (Alfa Aesar). Available pack sizes: 10mg, 25mg, 50mg, 100mg, 200mg, 5g, 25g.