InChI=1S/C13H17NO6S/c1-3-10(12(15)16)11(13(17)18)14-21(19,20)9-6-4-8(2)5-7-9/h4-7,10-11,14H,3H2,1-2H3,(H,15,16)(H,17,18)/t10-,11+/m1/s1