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Structure of macrolide antibiotics. (a) Structure of the 15-membered macrolide, azithromycin, and its modified analogues (names used in the text underlined, in brackets). (b) Structure of the 14-membered macrolide, erythromycin A, and its modified analogues. (c) Structure of the 16-membered macrolide, spiramycin. (d) Structure of the non-macrolide antibiotic, clindamycin
