ERROR opening https://cactus.nci.nih.gov/chemical/structure/c3cccc1c3n%28CCCCC%29c%28cc2%29c1cc2C%28%3DO%29N4CCCCC4/file?format=sdf&get3d=True  -- c3cccc1c3n%28CCCCC%29c%28cc2%29c1cc2C%28%3DO%29N4CCCCC4 could not be loaded.