InChI=1S/C20H22N2O5/c1-10(23)8-14(24)22-17(25)16-12(19(22,2)3)9-11-6-5-7-13-15(11)20(16,27)18(26)21(13)4/h5-7,12,16,27H,8-9H2,1-4H3/t12-,16+,20?/m1/s1