ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC2/N%3DC%5C1/N%28c3cc%28c%28cc3/N%3DC/1C%28%3DO%29N2%29C%29C%29C/file?format=sdf&get3d=True  -- O%3DC2/N%3DC%5C1/N%28c3cc%28c%28cc3/N%3DC/1C%28%3DO%29N2%29C%29C%29C could not be loaded.