What is 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 called?

oxalan — 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. (Webster's 1913.)

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