InChI=1S/C20H32/c1-14-12-16-6-7-17-18(2,3)9-5-10-19(17,4)20(16)11-8-15(14)13-20/h12,15-17H,5-11,13H2,1-4H3/t15-,16+,17+,19+,20-/m1/s1