6-[2-(4,9-Dihydro-5,8-dihydroxy-7-methoxy-4,9-dioxonaphtho[2,3-b]furan-2-yl)ethyl]-7,8-dihydroxy-1-oxo-1H-2-benzopyran-3-carboxylic acid methyl ester;γ-Isorubromycin
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