ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%28%5CN%3DC2/c1c%28cccc1%29C4CC4c3c2cccc3%29CCN/file?format=sdf&get3d=True  -- O%28%5CN%3DC2/c1c%28cccc1%29C4CC4c3c2cccc3%29CCN could not be loaded.