Heterocyclic compounds containing a five- membered ring consisting of three carbon and two nitrogen atoms. Pyrazole derivatives are formed by the condensation of hydrazines with compounds containing two -CO groups, or a -CO and a -COOH group, in the beta position, or which contain a -CO or -COOH group attached to a doubly linked carbon atom. Pyrazoles have a similar chemical character to benzene and pyridine,

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