ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCN%28C%29CCC1%3DCNC2%3DC1C%3DC%28C%3DC2F%29OC/file?format=sdf&get3d=True  -- CCN%28C%29CCC1%3DCNC2%3DC1C%3DC%28C%3DC2F%29OC could not be loaded.