ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28Nc1c%28cccc1C%29C%29c2ccc%28N%29cc2/file?format=sdf&get3d=True -- O%3DC%28Nc1c%28cccc1C%29C%29c2ccc%28N%29cc2 could not be loaded.