ERROR opening https://cactus.nci.nih.gov/chemical/structure/C1%3DCC%3DC2C%28%3DC1%29C%28%3DCN2%29CCO/file?format=sdf&get3d=True  -- C1%3DCC%3DC2C%28%3DC1%29C%28%3DCN2%29CCO could not be loaded.