ERROR opening https://cactus.nci.nih.gov/chemical/structure/COc1cccc2c1C%28C%3DO%29%3DC%28CO%29OC%28C%29%3DC2/file?format=sdf&get3d=True  -- COc1cccc2c1C%28C%3DO%29%3DC%28CO%29OC%28C%29%3DC2 could not be loaded.