ERROR opening https://cactus.nci.nih.gov/chemical/structure/OC%28%5CC%3DC%5Cc1ccc%28OC%29cc1%29CN2CCOCC2/file?format=sdf&get3d=True  -- OC%28%5CC%3DC%5Cc1ccc%28OC%29cc1%29CN2CCOCC2 could not be loaded.