InChI=1S/C23H23NO4/c1-26-15-4-5-16-18(7-15)20-9-23-22(27-12-28-23)8-19(20)17-6-13-2-3-14(25)10-24(13)11-21(16)17/h4-5,7-9,13-14,25H,2-3,6,10-12H2,1H3