title: Some chemical and stereochemical modifications of the erythromycin lactone rings.
mesh_terms: D002942:Circular Dichroism; D003500:Cyclization; D004917:Erythromycin / Q000031:analogs & derivatives* / Q000138:chemical synthesis; D006863:Hydrogen-Ion Concentration; D007783:Lactones; D008698:Mesylates; D013237:Stereoisomerism; D013329:Structure-Activity Relationship
chemical_list: D007783:Lactones; D008698:Mesylates; D004917:Erythromycin