ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28%3DC%29C1CN2C%3DCC%28N%3DC2N1OC%29%28C%29C/file?format=sdf&get3d=True  -- CC%28%3DC%29C1CN2C%3DCC%28N%3DC2N1OC%29%28C%29C could not be loaded.