ERROR opening https://cactus.nci.nih.gov/chemical/structure/c4c%28Cl%29cccc4OCc%28c1c3N%29nn%28c1ncn3%29C2CCOCC2/file?format=sdf&get3d=True  -- c4c%28Cl%29cccc4OCc%28c1c3N%29nn%28c1ncn3%29C2CCOCC2 could not be loaded.