ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN%28C%29CCC1%3DC%28NC2%3DC1C%3DC%28C%3DC2%29OC%29C3%3DCC%3DCC%3DC3/file?format=sdf&get3d=True -- CN%28C%29CCC1%3DC%28NC2%3DC1C%3DC%28C%3DC2%29OC%29C3%3DCC%3DCC%3DC3 could not be loaded.