or
Guanidine Hydrochloride, 99+%, MP Biomedicals, 25g, F.W. 95.53, CH5N3 -- HCl, CAS: 50-01-1
Guanidine Hydrochloride, ~99%, (Crystalline/Optical Grade), MP Biomedicals, 25g, F.W. 95.5, CH5N3 -- HCl, CAS: 50-01-1