ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C18H30O2/c19-18(20)16-10-8-6-4-2-1-3-5-7-9-13-17-14-11-12-15-17/h2,4,11,14,17H,1,3,5-10,12-13,15-16H2,(H,19,20)/b4-2 /file?format=sdf&get3d=True  -- InChI=1S/C18H30O2/c19-18(20)16-10-8-6-4-2-1-3-5-7-9-13-17-14-11-12-15-17/h2,4,11,14,17H,1,3,5-10,12-13,15-16H2,(H,19,20)/b4-2  could not be loaded.