"azithromycin-ep-impurity-b-2r-3r-4s-5r-8r-10r-11r-12s-13s-14r-13-2-6-dideoxy-3-c-methyl-3-o-methyl-l-ribo-hexopyranosyl-oxy-2-ethyl-4-10-dihydroxy-3-5-6-8-10-12-14-heptamethyl-11-3-4-6-trideoxy-3-dimethylamino-d-xylo-hexopyranosyl-oxy-1-oxa-6"

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