CAS 13551-73-0 appears in our catalog under these names: 5-Chloro-1,3-dimethyl-4-nitro-1H-pyrazole, 5-Chloro-1,3-dimethyl-4-nitro-1H-pyrazole 97%, 5-Chloro-1,3-dimethyl-4-nitro-1H-pyrazole, 97%, 97%, 5-Chloro-4-nitro-1,3-dimethylpyrazole, 97%. Offered by: Biosynth, Ambeed, Chemat, Fluorochem. Available pack sizes: 5g, 250mg, 1g, 25g.