In 1990, a proposal towards a normalization of pteridine nomenclature was published by Drs. Juan Ferre (Valencia, Spain), Kenneth Bruce Jacobson (Oak Rridge, Tennessee) and Wolfgang Pfleiderer)Konstnaz, Germany) in the journal PTERIDINES 1990;2:129. It can be assessed at the web-page of the journal at de-Gruyter Publishers: www.degruyter.com/view/j/pteridines