title: Letter: An unequivocal total synthesis of L-erythro-biopterin.
mesh_terms: D007536:Isomerism; D008722:Methods; D010084:Oxidation-Reduction; D011409:Propylene Glycols / Q000138:chemical synthesis*; D011621:Pteridines / Q000138:chemical synthesis*
chemical_list: D011409:Propylene Glycols; D011621:Pteridines