ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28OC%29CN%28C%28%3D%5BN%40H%5D%29N%29C/file?format=sdf&get3d=True  -- O%3DC%28OC%29CN%28C%28%3D%5BN%40H%5D%29N%29C could not be loaded.