ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCCC1C%28%3DO%29NN%28C1%3DO%29C2%3DCC%3DCC%3DC2/file?format=sdf&get3d=True  -- CCCCC1C%28%3DO%29NN%28C1%3DO%29C2%3DCC%3DCC%3DC2 could not be loaded.