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Erythromycin Impurity B (3’N-desmethyl erythromycin A)
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Erythromycin Impurity D (Anhydro)
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Erythromycin Impurity E
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Erythromycin Impurity F
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Erythromycin Impurity H (N-oxide)
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Erythromycin Impurity J (9-Oxime)
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Erythromycin Impurity L (N-desmethyl – N-formoyl erythromycin A)