When arginine is split, it forms an ornithine molecule and a molecule of this; the principal end product of mammalian nitrogen metabolism.  
Melamine resin is formed by dehydration of this compound, while barbiturates can also be formed by addition of this compound to malonic acid.  Other uses of this compound include separation of racemic mixtures.  Originally produced by a reaction between silver cyanate with ammonium chloride, it is now made in indusrial quantities by heating carbon dioxide with ammonia.  When arginine is split, it forms an ornithine molecule and a molecule of this; the principal end product of mammalian nitrogen metabolism.  First isolated by H.M. Rouelle, FTP, name the compound used to disprove the theory of vitalism when, in 1828 Friedrich Wohler, first synthesized it from inorganic materials.
Melamine resin is formed by dehydration of this compound, while barbiturates can also be formed by addition of this compound to malonic acid.  
urea (accept carbamide early)