ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCC1%3DC%28NC2%3DC1C%3DC%28C%3DC2%29N%28C%29C%29C/file?format=sdf&get3d=True  -- CCC1%3DC%28NC2%3DC1C%3DC%28C%3DC2%29N%28C%29C%29C could not be loaded.