InChI=1S/C20H22N2O5/c23-15-6-3-4-12(9-15)8-14(11-18(25)22-27)20(26)21-19-16-7-2-1-5-13(16)10-17(19)24/h1-7,9,14,17,19,23-24,27H,8,10-11H2,(H,21,26)(H,22,25)/t14-,17-,19+/m1/s1