c5h5n5o


From The Collaborative International Dictionary of English v.0.48:

Guanin \Gua"nin\, n. (Physiol. Chem.)
   A crystalline substance (C5H5N5O) contained in guano. It is
   also a constituent of the liver, pancreas, and other glands
   in mammals.
   [1913 Webster]
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