InChI=1S/C20H29NO4/c1-15(2)13-21-20(23)10-8-6-4-3-5-7-9-16-11-18-19(12-17(16)22)25-14-24-18/h7,9,11-12,15,22H,3-6,8,10,13-14H2,1-2H3,(H,21,23)/b9-7+