InChI=1S/C19H18N2O6/c1-9-15(22)16(23)17(24)19(26-9)27-18(25)10-5-4-8-13-14(10)21-12-7-3-2-6-11(12)20-13/h2-9,15-17,19,22-24H,1H3/t9-,15-,16+,17+,19+/m0/s1