InChI=1S/C15H20O7S/c1-6-4-11(22-23(18,19)20)13-8(3)15(17)21-14(13)12-7(2)10(16)5-9(6)12/h7-9,11-14H,1,4-5H2,2-3H3,(H,18,19,20)