ERROR opening https://cactus.nci.nih.gov/chemical/structure/s1cccc1C%28%3DO%29c2c%28Cl%29c%28Cl%29c%28cc2%29OCC%28%3DO%29O/file?format=sdf&get3d=True  -- s1cccc1C%28%3DO%29c2c%28Cl%29c%28Cl%29c%28cc2%29OCC%28%3DO%29O could not be loaded.