ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C18H28O2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20/h3-10H,2,11-17H2,1H3,(H,19,20)/b4-3-,6-5 ,8-7 ,10-9-/file?format=sdf&get3d=True  -- InChI=1S/C18H28O2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20/h3-10H,2,11-17H2,1H3,(H,19,20)/b4-3-,6-5 ,8-7 ,10-9- could not be loaded.