Urea [Chemical/Ingredient] Urea C0041942 Urea M0022315 D014508 N0000006999 A compound formed in the liver from ammonia produced by the deamination of amino acids. It is the principal end product of protein catabolism and constitutes about one half of the total urinary solids. Carbamide C24348 11002 Urea Organic Chemicals [Chemical/Ingredient]