ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCC1%3DCC2%3DC%28C%3DCC2%3DC%28C%3DC1%29C%29C/file?format=sdf&get3d=True  -- CCC1%3DCC2%3DC%28C%3DCC2%3DC%28C%3DC1%29C%29C could not be loaded.