The Collaborative International Dictionary of English v.0.48:

Lantanuric \Lan`ta*nu"ric\, a. [Formed by transposition of the
   letters of allantoin and -uric.] (Chem.)
   Pertaining to, or designating, a nitrogenous organic acid of
   the uric acid group, obtained by the decomposition of
   allantoin, and usually called allanturic acid.
   [1913 Webster]