ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C18H38/c1-4-6-8-10-11-12-13-15-17-18(3)16-14-9-7-5-2/h18H,4-17H2,1-3H3/file?format=sdf&get3d=True  -- InChI=1S/C18H38/c1-4-6-8-10-11-12-13-15-17-18(3)16-14-9-7-5-2/h18H,4-17H2,1-3H3 could not be loaded.