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A monocyclic heteroarene that is a five-membered organic heterocycle containing two nitrogen atoms at positions 1 and 2. ChEBI: 1H-pyrazole is the 1H-tautomer of pyrazole. It is a conjugate base of a pyrazolium. It is a conjugate acid of a pyrazol-1-ide. It is a tautomer of a 3H-pyrazole and a 4H-pyrazole.