1H-Naphtho02,3-c)pyran-3-acetic acid, 3,4,5,10-tetrahydro-4,9-dihydroxy-1-methyl-5,10-dioxo-8-02,3,6-trideoxy-3-(dimethylamino)-beta-D-arabino-hexopyranosyl)-, methyl ester, 01R-(1alpha,3beta,4beta))-