InChI=1S/C9H14N2O7/c1-11-7(16)9(10-8(11)17)6(15)5(14)4(13)3(2-12)18-9/h3-6,12-15H,2H2,1H3,(H,10,17)/t3-,4-,5+,6-,9+/m1/s1