ERROR opening https://cactus.nci.nih.gov/chemical/structure/FC1%3DCC%3DC%28C%3DC1%29C%28C%28CCC%29N2CCCC2%29%3DO/file?format=sdf&get3d=True  -- FC1%3DCC%3DC%28C%3DC1%29C%28C%28CCC%29N2CCCC2%29%3DO could not be loaded.