ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCCN%20%28CCCC%29%28CCCC%29CCCC.BrBr-Br/file?format=sdf&get3d=True  -- CCCCN%20%28CCCC%29%28CCCC%29CCCC.BrBr-Br could not be loaded.