InChI=1S/C11H14N2O6/c1-6(15)13-9(17)2-3-12(11(13)18)10-4-7(16)8(5-14)19-10/h2-3,7-8,10,14,16H,4-5H2,1H3/t7-,8+,10+/m0/s1