InChI=1S/C20H25NO4/c1-14(2)12-21-20(22)10-9-18-17(25-18)6-4-3-5-15-7-8-16-19(11-15)24-13-23-16/h3,5,7-11,14,17-18H,4,6,12-13H2,1-2H3,(H,21,22)/b5-3+,10-9+