ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC3%5CC%3DC/C%28%3DC2/Oc1c%28cc%28O%29cc1N2%29%5CC%3DC%29/C%3DC3/F/file?format=sdf&get3d=True -- O%3DC3%5CC%3DC/C%28%3DC2/Oc1c%28cc%28O%29cc1N2%29%5CC%3DC%29/C%3DC3/F could not be loaded.