InChI=1S/C22H26N2O4/c25-20-8-4-7-19-16-12-23-11-15(28-22(27)14-5-2-1-3-6-14)9-10-18(23)17(21(16)26)13-24(19)20/h1-3,5-6,15-19H,4,7-13H2