ERROR opening https://cactus.nci.nih.gov/chemical/structure/ClC%3D1C%28%3DO%29OC%28O%29C%3D1C%28Cl%29Cl/file?format=sdf&get3d=True  -- ClC%3D1C%28%3DO%29OC%28O%29C%3D1C%28Cl%29Cl could not be loaded.