ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC2c1ccccc1C%28%3DO%29C%3D3C2%3DC%28N%29CCC%3D3N/file?format=sdf&get3d=True -- O%3DC2c1ccccc1C%28%3DO%29C%3D3C2%3DC%28N%29CCC%3D3N could not be loaded.