1-Naphthacenecarboxylic acid, 4-((5-((2,6-dideoxy-4-O-(tetrahydro-6-methyl-5-oxo-2H-pyran-2-yl)-alpha-L-lyxo-hexopyranosyl)oxy)tetrahydro-6-methyl-2H-pyran-2-yl)oxy)-2-ethyl-1,2,3,4,6,11-hexahydro-2,5,7,10-tetrahydroxy-6,11-dioxo-, methyl ester, (1R-(1))