ERROR opening https://cactus.nci.nih.gov/chemical/structure/CNC1%3DC%28C%3DCC%3DC1OC%29C%28%3DO%29OC/file?format=sdf&get3d=True -- CNC1%3DC%28C%3DCC%3DC1OC%29C%28%3DO%29OC could not be loaded.