InChI=1S/C20H29NO3/c1-21-14-8-13-18(15-21)24-19(22)20(23,16-9-4-2-5-10-16)17-11-6-3-7-12-17/h2,4-5,9-10,17-18,23H,3,6-8,11-15H2,1H3/t18-,20?/m1/s1