InChI=1/C20H23NO4/c1-5-21(2)15-9-6-14(7-10-15)8-11-17(22)16-12-19(24-3)20(25-4)13-18(16)23/h6-13,23H,5H2,1-4H3/b11-8+ 670948ECBD6F2876