ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1%3DCC2%3DC%28C%28%3DC1%29Cl%29NC%3DC2CCN/file?format=sdf&get3d=True  -- C1%3DCC2%3DC%28C%28%3DC1%29Cl%29NC%3DC2CCN could not be loaded.