ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28NO%29c3ccc%28OCCNC%28%3DO%29c2oc1ccccc1c2CN%28C%29C%29cc3/file?format=sdf&get3d=True  -- O%3DC%28NO%29c3ccc%28OCCNC%28%3DO%29c2oc1ccccc1c2CN%28C%29C%29cc3 could not be loaded.