ERROR opening https://cactus.nci.nih.gov/chemical/structure/COC1%3DC%28C%3DC%28C%28%3DC1%29C%28C%29C%29OC%29CCN/file?format=sdf&get3d=True  -- COC1%3DC%28C%3DC%28C%28%3DC1%29C%28C%29C%29OC%29CCN could not be loaded.