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6β,9-Epoxy-8,9-didehydro-9-deoxo-6-deoxy-4'-O-(methylsulfonyl)erythromycin

6β,9-Epoxy-8,9-didehydro-9-deoxo-6-deoxy-4'-O-(methylsulfonyl)erythromycin ??? ???

???:: 6β,9-Epoxy-8,9-didehydro-9-deoxo-6-deoxy-4'-O-(methylsulfonyl)erythromycin

???(??):: 6β,9-Epoxy-8,9-didehydro-9-deoxo-6-deoxy-4'-O-(methylsulfonyl)erythromycin

6β,9-Epoxy-8,9-didehydro-9-deoxo-6-deoxy-4'-O-(methylsulfonyl)erythromycin ??

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