ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C20H42/c1-4-6-7-8-9-10-11-12-13-14-15-16-17-18-19-20(3)5-2/h20H,4-19H2,1-3H3/file?format=sdf&get3d=True -- InChI=1S/C20H42/c1-4-6-7-8-9-10-11-12-13-14-15-16-17-18-19-20(3)5-2/h20H,4-19H2,1-3H3 could not be loaded.