ERROR opening https://cactus.nci.nih.gov/chemical/structure/c3cc2c%28/C%28c1c%28cccc1%29CN2CCCN%28C%29C%29%3DC%29cc3/file?format=sdf&get3d=True  -- c3cc2c%28/C%28c1c%28cccc1%29CN2CCCN%28C%29C%29%3DC%29cc3 could not be loaded.