title: The structure of the purine precursor in riboflavin biosynthesis.
mesh_terms: D002247:Carbon Isotopes; D055598:Chemical Phenomena; D002621:Chemistry; D004754:Enterobacter / Q000378:metabolism; D011687:Purines; D012256:Riboflavin / Q000096:biosynthesis*
chemical_list: D002247:Carbon Isotopes; D011687:Purines; D012256:Riboflavin