InChI=1S/C16H18N4O5S/c17-15(18)11-5-2-9(3-6-11)1-4-10-7-8-12(16(19)20)14(13(10)21)25-26(22,23)24/h1-8,12,14H,17-18H2,(H3,19,20)(H,22,23,24)/b10-4+