ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28O%29%5CC%3DC/c1cc%28O%29c%28O%29c%28OC%29c1/file?format=sdf&get3d=True  -- O%3DC%28O%29%5CC%3DC/c1cc%28O%29c%28O%29c%28OC%29c1 could not be loaded.