ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28O%29CN/1/C%3DC%28/I%29C%28%3DO%29C%28%5CI%29%3DC%5C1/file?format=sdf&get3d=True  -- O%3DC%28O%29CN/1/C%3DC%28/I%29C%28%3DO%29C%28%5CI%29%3DC%5C1 could not be loaded.