6β,9-Epoxy-8,9-didehydro-9-deoxo-6,11-dideoxy-11-methoxyerythromycin
6β,9-Epoxy-8,9-didehydro-9-deoxo-6,11-dideoxy-11-methoxyerythromycin ??
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6β,9-Epoxy-8,9-didehydro-9-deoxo-6,11-dideoxy-11-methoxyerythromycin ?? ?? ? ???
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6β,9-Epoxy-8,9-didehydro-9-deoxo-6,11-dideoxy-11-methoxyerythromycin ?? ??
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