ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCN%28CCC1%3DCC%28%3DC%28C%3DC1%29Cl%29Cl%29CCN2CCCC2/file?format=sdf&get3d=True  -- CCN%28CCC1%3DCC%28%3DC%28C%3DC1%29Cl%29Cl%29CCN2CCCC2 could not be loaded.