CAS 50-01-1 appears in our catalog under these names: Guanidine hydrochloride, 98% , Guanidine hydrochloride, 99+% , Guanidine hydrochloride, ultra , Guanidine hydrochloride, Molecular Biology Grade , Guanidine hydrochloride, 99.5+%, Molecular Biology Grade, Th. Offered by: Thermo Scientific (Alfa Aesar). Available pack sizes: 1000g, 5000g, 250g, 100g, 500g, 1kg, 5kg.