ERROR opening https://cactus.nci.nih.gov/chemical/structure/OC%28%3DO%29c1c%28Cl%29ccc2cc%28Cl%29cnc12/file?format=sdf&get3d=True  -- OC%28%3DO%29c1c%28Cl%29ccc2cc%28Cl%29cnc12 could not be loaded.