ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC3c1c%28cccc1O%29CC%28O3%29c%28cc2O%29ccc2O/file?format=sdf&get3d=True  -- O%3DC3c1c%28cccc1O%29CC%28O3%29c%28cc2O%29ccc2O could not be loaded.