ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCOC1%3DC%28C%3DC%28C%3DC1OC%29CCN%29OC/file?format=sdf&get3d=True  -- CCOC1%3DC%28C%3DC%28C%3DC1OC%29CCN%29OC could not be loaded.