2,4-Dimethyl-3,4-O-isopropylidene-L-arabinono-1,5-lactone

The relative configuration at C-2 of 2,4-dimethyl-3,4-O-isopropyl-idene-l- arabinono lactone, C10H16O5, which exists in the boat form, was unequivocally established by X-ray crystallographic analysis. The absolute configuration was determined by the use of 2-C-methyl-d-ribonolactone as a starting material. © 2007 International Union of Crystallography