title: Azetidinone sulfenic acids. Isolation of crystalline sulfenic acids from penicillin sulfoxides and a study of their reactivities.
mesh_terms: D003460:Crystallization; D008722:Methods; D010406:Penicillins / Q000032:analysis; D013434:Sulfenic Acids / Q000302:isolation & purification*; D013454:Sulfoxides / Q000032:analysis
chemical_list: D010406:Penicillins; D013434:Sulfenic Acids; D013454:Sulfoxides