Pterin is a heterocyclic compound composed of a pteridine ring system, with a keto group and an amino group on positions 4 and 2 respectively. Several tautomers of pterin exist and are shown below. Derivatives of pterin include pterins and folates. Pterins, as a group, are compounds that are derivatives of the basic pterin structure, described in ...
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http://en.wikipedia.org/wiki/Pterin
(from the article `coloration`) Closely related to the purines and formerly classed among them are the pterins, so named from their notable appearance in and first chemical ...
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http://www.britannica.com/eb/a-z/p/128
Term loosely used for any of the compounds containing pteridine; specifically, 2-amino-4-hydroxypteridine. Some pteridines (e.g., xanthopterin, leucopterin) still retain the pterin root. ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973
Type: Term Pronunciation: ter′in Definitions: 1. Term loosely used for any of the compounds containing pteridine; specifically, 2-amino-4-hydroxypteridine. Some pteridines (xanthopterin, leucopterin) still retain the pterin root.
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http://www.medilexicon.com/medicaldictionary.php?t=73797
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