ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCCOC1%3DC%28C%3DCC%3DC1N%29C%28%3DO%29OCCN%28CC%29CC/file?format=sdf&get3d=True  -- CCCCOC1%3DC%28C%3DCC%3DC1N%29C%28%3DO%29OCCN%28CC%29CC could not be loaded.