3,5-Di-O-benzoyl-1,2-O-isopropyl­idene-α-d-ribo-hexos-3-ulo-1,4:3,6-difuran­ose

The title compound, C(23)H(22)O(8), is a binary benzoyl ester whose nucleus consists of a fused system made up of a methyl­enedi­oxy ring and two tetra­hydro­furan rings. One of the benzoyl ester groups is attached at the junction of the two tetra­hydro­furan rings. The other is attached to the outer tetra­furan ring. Both the benzoyl ester groups are in an axial conformation with respect to the outer tetrhydro­furan ring. In the crystal, mol­ecules are linked by two weak C—H⋯O hydrogen bonds, forming a chain running parallel to the a axis.