Erythromycin ethylsuccinate. Molecular model of the antibiotic drug erythromycin ethylsuccinate (C37.H67.N.O13). This ester of erythromycin is taken orally. Erythromycin is an antibiotic produced by a strain of Streptomyces erythreus, and used for the treatment of pneumonia. Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white), nitrogen (blue) and oxygen (red). Illustration.
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