InChI=1S/C20H34O2/c1-6-15(2)8-9-17-19(4)12-7-11-18(3,14-21)16(19)10-13-20(17,5)22/h6,8,16-17,21-22H,1,7,9-14H2,2-5H3/b15-8+/t16-,17+,18-,19-,20+/m1/s1