ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN%28C1%29CCC2%3DC1C%28C3%3DC2C%3DCC%3DC3%29C4%3DCC%3DCC%3DC4/file?format=sdf&get3d=True  -- CN%28C1%29CCC2%3DC1C%28C3%3DC2C%3DCC%3DC3%29C4%3DCC%3DCC%3DC4 could not be loaded.