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/h4-11H,2-3,12-17H2,1H3,(H,19,20)/b5-4 ,7-6-,9-8-,11-10-/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/h4-11H,2-3,12-17H2,1H3,(H,19,20)/b5-4 ,7-6-,9-8-,11-10- could not be loaded.