5-O,6-O-Isopropylidene-L-ascorbic acid 2-sulfate

5,?6-?O-?(1-?Methylethylidene)?-?L-?ascorbic Acid 2-?(Hydrogen Sulfate) is an intermediate in the synthesis of L-threo-Hex-?2-?enaric acid 1,?4-Lactone (H294830), an impurity of L-Ascorbic Acid (A786990) which is a physiological antioxidant.