H CH3 O H3C CH3 co CH3 CH HoC O CH3 CH3 Leucomycin A1 CH3 CH3 o HC HC N CH3 HCO HOLO CH3 OH CH3 H3C CH3 CH3 Midecamycin A1O OH CH3 O OH H3CO O H3C O HO CH3 O O OH CH3 O O CH3 CH3 N H3C CH3 Leucomycin A1 HC O CH3 O OH CH3 O O H3CO O H3C O HO CH3 O O OH CH3 O CH3 O N CH3 HC O O CH3 Midecamycin A1 H3C CH3