InChI=1S/C20H22N2O5/c1-10(23)18-12-7-17-20(8-15(21-18)13(12)9-27-17)14-5-4-11(25-2)6-16(14)22(26-3)19(20)24/h4-6,12-13,15,17H,7-9H2,1-3H3/t12-,13+,15+,17-,20+/m1/s1