ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%28%3DO%29O-%29OC1%3DCC%3DC%28C%3DC1%29OC.Na%20/file?format=sdf&get3d=True  -- CC%28C%28%3DO%29O-%29OC1%3DCC%3DC%28C%3DC1%29OC.Na%20 could not be loaded.