InChI=1S/C12H14O7S/c1-17-11-7-8(6-9-3-5-12(13)18-9)2-4-10(11)19-20(14,15)16/h2,4,7,9H,3,5-6H2,1H3,(H,14,15,16)/t9-/m1/s1