1,5-anhydro-2,3,6-trideoxy-3-(dimethylamino)-1-(11-hydroxy-5-methyl-2-{2-methyl-3-[(1E)-prop-1-en-1-yl]oxiran-2-yl}-4,7,12-trioxo-7,12-dihydro-4H-naphtho[2,3-h]chromen-10-yl)-3-methylhexitol