InChI=1S/C15H18O4S/c1-13(2)10(17)8-9(11(13)18)14(3)6-5-20-12(8)15(14,19)4-7(6)16/h6,11-12,18-19H,4-5H2,1-3H3/t6-,11-,12-,14+,15+/m0/s1