In Vivo Study of Compounds 3-(acetyl Salicyloyl)-5,6 –Oisopropylidene-L-Ascorbic Acid ,2,3- (acetyl Salicyloyl)-5,6 –O-Isopropylidene-L-Ascorbic Acid and 2,3,5,6Tetra(acetyl Salicyloyl)-L-Ascorbic Acid. IHJPAS 2017, 22 (2).