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