ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28c1ccc%28Cl%29cc1%29c2ccc%28Cl%29cc2/file?format=sdf&get3d=True  -- O%3DC%28c1ccc%28Cl%29cc1%29c2ccc%28Cl%29cc2 could not be loaded.