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c6h4n4o5
From The Collaborative International Dictionary of English v.0.48:
Oxalantin \Ox`a*lan"tin\, n. [From Alloxantin, by transposition of letters.] (Chem.) A white crystalline nitrogenous substance (C6H4N4O5) obtained by the reduction of parabanic acid; -- called also leucoturic acid. [1913 Webster]

