InChI=1S/C15H20O7S/c1-7-4-5-9-11(7)13-12(8(2)14(16)21-13)10(6-15(9,3)17)22-23(18,19)20/h4,9-13,17H,2,5-6H2,1,3H3,(H,18,19,20)