ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC2%5CN%3DC%28/OC2c1ccccc1%29N%28C%29C/file?format=sdf&get3d=True  -- O%3DC2%5CN%3DC%28/OC2c1ccccc1%29N%28C%29C could not be loaded.