29331990 (01/1988-..) Heterocyclic compounds with nitrogen hetero-atom[s] only, containing an unfused pyrazole ring, whether or not hydrogenated, in the structure (excl. phenazone `antipyrin` and its derivatives and phenylbutazone (INN))
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29331990 (01/1988-..) Heterocyclic compounds with nitrogen hetero-atom[s] only, containing an unfused pyrazole ring, whether or not hydrogenated, in the structure (excl. phenazone `antipyrin` and its derivatives and phenylbutazone (INN))
