ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28NC%28C%29%28C%29C%29C%28%3DO%29c1cccc%28Cl%29c1/file?format=sdf&get3d=True  -- CC%28NC%28C%29%28C%29C%29C%28%3DO%29c1cccc%28Cl%29c1 could not be loaded.