ERROR opening https://cactus.nci.nih.gov/chemical/structure/c2cc%28Cl%29ccc2N%28CC3%29CCN3Cc1cnc4c1cccn4/file?format=sdf&get3d=True  -- c2cc%28Cl%29ccc2N%28CC3%29CCN3Cc1cnc4c1cccn4 could not be loaded.