abstract |
According to the present invention, it is possible to efficiently remove 13-dihydroepi-daunorubicin and 4′-epi-feudomycin, which are typical impurities possibly contained in 4′-epi-daunorubicin as a starting material, by using an organic acid salt of 4′-epi-daunorubicin or a hydrate or solvate thereof as a novel production intermediate, thus making it possible to produce high-purity epirubicin. |