ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCC1%3DCC%3DC%28C%3DC1%29C%28%3DO%29C%28C%29CN2CCCC2/file?format=sdf&get3d=True  -- CCC1%3DCC%3DC%28C%3DC1%29C%28%3DO%29C%28C%29CN2CCCC2 could not be loaded.