title: The removal and displacement of the thiazolidine ring of penicillin. I. 3-acylaminoazetidinone and 3-acylamino-4-phenylthioazetidinone.
mesh_terms: D000215:Acylation; D000596:Amino Acids; D055598:Chemical Phenomena; D002621:Chemistry; D003500:Cyclization; D010406:Penicillins; D013844:Thiazoles
chemical_list: D000596:Amino Acids; D010406:Penicillins; D013844:Thiazoles