ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC2c1cccc%28O%29c1C%28%3DO%29c3c2cccc3O/file?format=sdf&get3d=True  -- O%3DC2c1cccc%28O%29c1C%28%3DO%29c3c2cccc3O could not be loaded.