InChI=1S/C22H26N2O4/c1-4-12-9-13-11-22(21(26)28-3)18-15(7-8-24(19(12)22)20(13)25)16-10-14(27-2)5-6-17(16)23-18/h5-6,10,12-13,19,23H,4,7-9,11H2,1-3H3