Pteridine is an aromatic chemical compound composed of fused pyrimidine and pyrazine rings. A pteridine is also a group of heterocyclic compounds containing a wide variety of substitutions on this structure. Pterins and flavins are classes of substituted pteridines that have important biological activity. Pteridine, is a precursor in the synthesis...
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(from the article `pyrazine`) Other members of the pyrazine family are pteridines, alloxazines, and phenazines. Certain pigments, first isolated from butterfly wings in 1891, are ...
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http://www.britannica.com/eb/a-z/p/128
Azinepurine; benzotetrazine; pyrazino[2,3-d]pyrimidine;a two-ring heterocyclic compound found as a component of pteroic acid and the pteroylglutamic acids (folic acids, pteropterin, etc.); simple pteridine derivatives (e.g., xanthopterin, leucopterin) occur as pigments in butterfly wings, whence the name. ... (05 Mar 2000) ...
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(= pyrazino2,3-dpyrimidine) Nitrogen-containing compound composed of two six-membered rings (pyrazine and pyrimidine rings). Structural component of folic acid and riboflavin and parent compound of pterins such as xanthopterin, a yellow pigment found in the wings of some butterflies.
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Type: Term Pronunciation: ter′i-dēn Definitions: 1. a two-ring heterocyclic compound found as a component of pteroic acid and the pteroylglutamic acids (folic acids, pteropterin, etc.); simple pteridine derivatives (xanthopterin, leucopterin) occur as pigments in butterfly wings, whence the name.
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http://www.medilexicon.com/medicaldictionary.php?t=73796
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