Erythromycin is a broad-spectrum macrolide antibiotic derived from Saccharopolyspora erythraea (formerly Streptomyces erythraeus) that inhibits bacterial protein synthesis. It is composed largely of Erythromycin A, with small amounts of Erythromycin B and C. It is typically used at a concentration of 100 mg/L. Erythromycin is soluble in ethanol and 2M HCl but sparingly soluble in water.
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