InChI=1S/C12H14Cl2O8S/c1-21-8-3-6(11(17)9(16)5-8)2-7(15)4-10(12(13)14)22-23(18,19)20/h3,5,10,12,16-17H,2,4H2,1H3,(H,18,19,20)