InChI=1S/C21H26NO8S/c1-13(23)22(2)8-7-15-11-20(29-4)18(24)12-16(15)17(22)9-14-5-6-19(28-3)21(10-14)30-31(25,26)27/h5-6,10-12,17,24H,7-9H2,1-4H3,(H,25,26,27)