The O , O ′-diacetyl ( R , R )-hydrogentartrate ester of ( S )-pantolactoneTartaric acid and its O -acyl derivatives. Part 3.

The synthesis of the title compound, (1R,2R)-1-carb­oxy-2-[(3S)-4,4-dimethyl-2-oxotetra­hydro­furan-3-yloxycarbonyl]ethane-1,2-diyl diacetate, C14H18O10, from diacetyl­tartaric acid anhydride and pantolactone gave two enanti­omeric pairs and the crystal structure of the R,R,S enanti­omer is presented here. The mol­ecule consists of a hydrogen tartrate fragment in which the carboxyl group and the lactone ester group are in an anti conformation. In the crystal structure, mol­ecules are linked into C(10) chains by an inter­molecular O—H⋯O hydrogen bond and further by C—H⋯O inter­actions to form a layer structure with the second-level graph-set descriptor R22(8)[R44(26)].