ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN1C2CC%28CC1C3C2O3%29OC%28%3DO%29C%28CO%29C4%3DCC%3DCC%3DC4/file?format=sdf&get3d=True  -- CN1C2CC%28CC1C3C2O3%29OC%28%3DO%29C%28CO%29C4%3DCC%3DCC%3DC4 could not be loaded.