CH H3C OCH. H3C、CH3 --CH CH H3C 00—cH CH H2C、OH OH H2C、CH C OCH3 OH CH3 CH CH OH H3C 0o—cH O CLARITHROMYCIN CH 14 member rings 2 CH CH O H3CAN CH3 OCH CH CH H3C.HO OH -CHa H3C CH OH HO CH H3C CH ERYTHROMYCIN CH2 CH OCH 14 member rings CH CH CH AZITHROMYCIN 15 member rings14 member rings 15 member rings 14 member rings