ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28O%29C%28C%29%28C%29CCCOc1cc%28ccc1C%29C/file?format=sdf&get3d=True -- O%3DC%28O%29C%28C%29%28C%29CCCOc1cc%28ccc1C%29C could not be loaded.