title: Tautomerism of the nucleoside antibiotic formycin, as studied by carbon-13 nuclear magnetic resonance.
mesh_terms: D000903:Antibiotics, Antineoplastic / Q000032:analysis*; D002247:Carbon Isotopes; D007536:Isomerism; D009682:Magnetic Resonance Spectroscopy; D008722:Methods; D011720:Pyrazoles / Q000032:analysis; D011743:Pyrimidines / Q000032:analysis; D011744:Pyrimidinones / Q000032:analysis; D012263:Ribonucleosides / Q000032:analysis*
chemical_list: D000903:Antibiotics, Antineoplastic; D002247:Carbon Isotopes; D011720:Pyrazoles; D011743:Pyrimidines; D011744:Pyrimidinones; D012263:Ribonucleosides