InChI=1S/C19H18N2O8/c22-18(28-12-14-4-1-6-16(10-14)20(24)25)8-3-9-19(23)29-13-15-5-2-7-17(11-15)21(26)27/h1-2,4-7,10-11H,3,8-9,12-13H2