InChI=1S/C18H24N2O4S/c1-12(2)8-9-24-14-6-4-13(5-7-14)10-18(25-3)17(23)19-15(11-21)16(22)20-18/h4-8,15,21H,9-11H2,1-3H3,(H,19,23)(H,20,22)/t15-,18+/m0/s1