title: Identification of 2-amino-4-hydroxy substituted pteridines by gas-liquid chromatography and mass spectrometry.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D002849:Chromatography, Gas; D002855:Chromatography, Thin Layer; D013058:Mass Spectrometry; D008722:Methods; D011622:Pterins / Q000302:isolation & purification*; D014976:Xanthopterin / Q000032:analysis / Q000302:isolation & purification
chemical_list: D011622:Pterins; D014976:Xanthopterin