InChI=1S/C20H37NO3/c1-4-21(5-2)15-16(3)24-19(22)18-13-9-10-14-20(18,23)17-11-7-6-8-12-17/h16-18,23H,4-15H2,1-3H3/t16?,18-,20+/m1/s1