ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCCCCCCCCCCCCCCCCN%28CCCN%28CCO%29CCO%29CCO.F.F/file?format=sdf&get3d=True  -- CCCCCCCCCCCCCCCCCCN%28CCCN%28CCO%29CCO%29CCO.F.F could not be loaded.