ERROR opening https://cactus.nci.nih.gov/chemical/structure/COc2cc%28O%29ccc2/C%3DC/c1cc%28O%29cc%28O%29c1/file?format=sdf&get3d=True  -- COc2cc%28O%29ccc2/C%3DC/c1cc%28O%29cc%28O%29c1 could not be loaded.