Erythromycin B, EvoPure® is a highly purified form of erythromycin B, an active component of Erythromycin. Other components include A, C, and D. Erythromycins B has a similar MICs to A but is slightly less active. Erythromycin B lacks a hydroxyl group at C12 that Erythromycin A has, allowing it to retain antibacterial activity in acidic environments unlike Erythromycin A.
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