CAS 1955564-51-8 appears in our catalog under these names: 3-Hydrazinylidene-2-methyl-2,3-dihydro-1h-pyrazole dihydrochloride, 95%, 3-Hydrazono-2-methyl-2,3-dihydro-1H-pyrazole dihydrochloride, 98%. Offered by: Combi-blocks, AmBeed. Available pack sizes: 1g, 250mg, 100mg, 5g, 10g.