ERROR opening https://cactus.nci.nih.gov/chemical/structure/ClC%28Cl%29%28Cl%29c2nc%28nn2c1ccc%28Cl%29cc1Cl%29C%28%3DO%29O/file?format=sdf&get3d=True  -- ClC%28Cl%29%28Cl%29c2nc%28nn2c1ccc%28Cl%29cc1Cl%29C%28%3DO%29O could not be loaded.