n :  a white odorless and tasteless nearly insoluble diacid C₅H₄N₄O₃ that is present in small quantity in mammalian urine, is present abundantly in the form of urates in the excreta of most lower vertebrates and invertebrates as the chief nitrogenous waste, and occurs pathologically in renal calculi and the tophi of gout .
 
 
 
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