Definition: This compound is a ketoester of 4-aminophenol (4190.757981), which is found in amino acids and also contains a hydroxyamine moiety. It has been identified as 1-pyrazole-1-carboxylic acid, with the functional group being esterified at position 6. The compound is designated as 4H-pyrazole-1-carboxylic acid, and it can be used for its pharmacological, metabolic, or chemical properties.