ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28Cl%29c1ccc%28C%28Cl%29%3DO%29cc1/file?format=sdf&get3d=True  -- O%3DC%28Cl%29c1ccc%28C%28Cl%29%3DO%29cc1 could not be loaded.