CAS 844891-13-0 appears in our catalog under these names: tert-Butyl 4-formyl-3,5-dimethyl-1h-pyrazole-1-carboxylate, 95%, tert-Butyl 4-formyl-3,5-dimethyl-1H-pyrazole-1-carboxylate, 97%, tert-butyl 4-formyl-3,5-dimethyl-1H-pyrazole-1-carboxylate, 97%, 97%. Offered by: Combi-blocks, AmBeed, Chemat. Available pack sizes: 250mg, 1g, 100mg, 500mg.