ERROR opening https://cactus.nci.nih.gov/chemical/structure/N%28/OC%29%3DC%5CC1%3DC%5CCCN%28C%29C1/file?format=sdf&get3d=True  -- N%28/OC%29%3DC%5CC1%3DC%5CCCN%28C%29C1 could not be loaded.