InChI=1S/C18H20O6S/c1-3-17(13-5-9-15(19)10-6-13)18(4-2,24-17)14-7-11-16(12-8-14)23-25(20,21)22/h5-12,19H,3-4H2,1-2H3,(H,20,21,22)