InChI=1S/C21H24O8S/c1-6-7-13-8-15-12(2)19(28-20(15)16(9-13)25-3)14-10-17(26-4)21(18(11-14)27-5)29-30(22,23)24/h6-12,19H,1-5H3,(H,22,23,24)