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5-nitro-1H-pyrazole-3-carboxylic acid; CAS No.: 198348-89-9; 5-Nitro-1H-pyrazole-3-carboxylic acid merges nitro and carboxyl groups for zwitterion formation. Our Library of Compounds includes this acidic pyrazole with pKa optimization data, enabling salt formation studies for solubility enhancement in kinase inhibitor formulations.