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From 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]