ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C20H40/c1-7-18(4)12-9-14-20(6)16-10-15-19(5)13-8-11-17(2)3/h7,17-20H,1,8-16H2,2-6H3/t18-,19-,20+/m0/s1/file?format=sdf&get3d=True  -- InChI=1S/C20H40/c1-7-18(4)12-9-14-20(6)16-10-15-19(5)13-8-11-17(2)3/h7,17-20H,1,8-16H2,2-6H3/t18-,19-,20+/m0/s1 could not be loaded.