InChI=1S/C20H22N2O6/c23-9-6-17-15(3-2-7-21-17)20(26)22-8-10-27-12-14(22)13-28-19-5-1-4-18(25)16(19)11-24/h1-5,7,11,14,23,25H,6,8-10,12-13H2/t14-/m1/s1