title: Synthesis and incorporation of (2S,3S)-(4-13C)valine into beta-lactam antibiotics.
mesh_terms: D000900:Anti-Bacterial Agents; D002247:Carbon Isotopes; D002511:Cephalosporins; D055598:Chemical Phenomena; D002621:Chemistry; D007553:Isotope Labeling; D010406:Penicillins; D013329:Structure-Activity Relationship; D014633:Valine; D047090:beta-Lactams / Q000138:chemical synthesis
chemical_list: D000900:Anti-Bacterial Agents; D002247:Carbon Isotopes; D002511:Cephalosporins; D010406:Penicillins; D047090:beta-Lactams; D014633:Valine