2933.19.18

Heterocyclic compounds with nitrogen hetero-atom(s) only: Compounds containing an unfused pyrazole ring (whether or not hydrogenated) in the structure: Other: Aromatic or modified aromatic: 2-Chloro-5-sulfophenylmethylpyrazolone; 2,5-Dichloro-4-(3-methyl-5-oxo-2- pyrazolin-1-yl) benzenesulfonic acid; Phenyl carbethoxypyrazolone;m-Sulfaminopyrazolone (m-Sulfamido- phenyl methyl pyrazolone); and 1-(p-Sulfophenyl)-3-methyl pyrazolone