InChI=1S/C18H18O9S/c1-5-18(2,9-26-28(20,21)22)12-8-11-13(23-3)10-6-7-25-14(10)16(24-4)15(11)27-17(12)19/h5-8H,1,9H2,2-4H3,(H,20,21,22)