Antibiotics containing a large macrocyclic lactone ring, used to treat a variety of bacterial infections
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3'-N-demethyl-3'-N-(phenylsulfonyl)erythromycin A
methyl-2,6,7-tridesoxy-2,4-di-C-methyl-3,5-di-O-benzyl-β-L-idohept-6-enofuranoside