(4S,5S)-5-[(R)-((S)-5,8-Dioxo-7,8-dihydro-5H-[1,3]dioxolo[4,5-g]isochromen-7-yl)-methoxymethoxy-methyl]-2,2-dimethyl-[1,3]dioxolane-4-carbaldehyde O-benzyl-oxime