InChI=1S/C8H12N2O8/c11-1-2-3(12)4(13)5(14)8(18-2)6(15)10(17)7(16)9-8/h2-5,11-14,17H,1H2,(H,9,16)/t2-,3-,4+,5-,8+/m1/s1