The Collaborative International Dictionary of English v.0.48:

Oxalan \Ox"a*lan\, n. [From Alloxan, by transposition of
   letters.] (Chem.)
   A complex nitrogenous substance C3N3H5O3 obtained from
   alloxan (or when urea is fused with ethyl oxamate), as a
   stable white crystalline powder; -- called also
   oxaluramide.
   [1913 Webster]