ERROR opening https://cactus.nci.nih.gov/chemical/structure/InChI=1S/C21H24/c1-3-5-7-9-11-13-15-17-19-21-20-18-16-14-12-10-8-6-4-2/h1-2,5-8H,9-15,17,19H2/b7-5-,8-6-/file?format=sdf&get3d=True  -- InChI=1S/C21H24/c1-3-5-7-9-11-13-15-17-19-21-20-18-16-14-12-10-8-6-4-2/h1-2,5-8H,9-15,17,19H2/b7-5-,8-6- could not be loaded.