InChI=1S/C21H24N2O4S/c1-14(24)27-19-20(15-8-10-16(25)11-9-15)28-18-7-5-4-6-17(18)23(21(19)26)13-12-22(2)3/h4-11,19-20,25H,12-13H2,1-3H3/t19-,20+/m1/s1