ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28/C%3DC/c1ccccc1%29/C%3DC/c2ccccc2/file?format=sdf&get3d=True  -- O%3DC%28/C%3DC/c1ccccc1%29/C%3DC/c2ccccc2 could not be loaded.