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From: Webster's Revised Unabridged Dictionary (1913)

 Mu·rex·ide n.  Chem. A crystalline nitrogenous substance (C8H8N6O6, 5-5'-nitrilodibarbituric acid monoammonium salt) having a splendid dichroism, being green by reflected light and garnet-red by transmitted light.  It was formerly used in dyeing calico, and was obtained in a large quantities from guano.  It is now synthesized from alloxan.  Formerly called also ammonium purpurate.
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