title: Chemical manipulations of the penicillin nucleus: a review.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D008712:Methicillin; D010400:Penicillin G; D010406:Penicillins
chemical_list: D010406:Penicillins; D010400:Penicillin G; D008712:Methicillin