ERROR opening https://cactus.nci.nih.gov/chemical/structure/OC%28%3DO%29C%3DCC1%3DCC%3DC%28O%29C%28O%29%3DC1/file?format=sdf&get3d=True -- OC%28%3DO%29C%3DCC1%3DCC%3DC%28O%29C%28O%29%3DC1 could not be loaded.