InChI=1S/C20H23NO4/c1-13-16-10-19(23-3)18(22-2)9-15(16)6-7-21(13)11-14-4-5-17-20(8-14)25-12-24-17/h4-5,8-10,13H,6-7,11-12H2,1-3H3/t13-/m1/s1