ERROR opening https://cactus.nci.nih.gov/chemical/structure/s1cccc1/C%28c2sccc2%29%3DC3%5CCCCN%28C%29C3/file?format=sdf&get3d=True  -- s1cccc1/C%28c2sccc2%29%3DC3%5CCCCN%28C%29C3 could not be loaded.