InChI=1S/C20H29NO4/c1-15(2)13-21-20(23)7-5-3-4-6-17(22)10-8-16-9-11-18-19(12-16)25-14-24-18/h8-12,15,17,22H,3-7,13-14H2,1-2H3,(H,21,23)/b10-8+