ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN1CCC2%3DCNC3%3DC2C1%3DC%28C%3DC3%29OC/file?format=sdf&get3d=True  -- CN1CCC2%3DCNC3%3DC2C1%3DC%28C%3DC3%29OC could not be loaded.