InChI=1S/C16H25N3O8S/c1-2-3-12(11(21)7-20)28-8-10(15(25)18-6-14(23)24)19-13(22)5-4-9(17)16(26)27/h2-3,7,9-12,21H,4-6,8,17H2,1H3,(H,18,25)(H,19,22)(H,23,24)(H,26,27)/b3-2+