ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1/C19H40/c1-3-5-7-9-11-13-15-17-19-18-16-14-12-10-8-6-4-2/h3-19H2,1-2H3/file?format=sdf&get3d=True  -- InChI=1/C19H40/c1-3-5-7-9-11-13-15-17-19-18-16-14-12-10-8-6-4-2/h3-19H2,1-2H3 could not be loaded.