Biosynthesis of thiamine. Formate, the precursor of carbon 4 of the pyrimidine ring.
D002247:Carbon Isotopes; D005561:Formates / Q000378:metabolism*; D008954:Models, Biological; D008956:Models, Chemical; D010084:Oxidation-Reduction; D011743:Pyrimidines / Q000096:biosynthesis* / Q000138:chemical synthesis; D012440:Saccharomyces / Q000378:metabolism*; D013831:Thiamine / Q000096:biosynthesis*
D002247:Carbon Isotopes; D005561:Formates; D011743:Pyrimidines; D013831:Thiamine