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/h7-8,11-12H,2-6,13-17H2,1H3,(H,19,20)/b8-7 ,12-11-/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/h7-8,11-12H,2-6,13-17H2,1H3,(H,19,20)/b8-7 ,12-11- could not be loaded.