ERROR opening https://cactus.nci.nih.gov/chemical/structure/N%28%3DC%28/Nc1ccccc1C%29N%29%5Cc2ccccc2C/file?format=sdf&get3d=True  -- N%28%3DC%28/Nc1ccccc1C%29N%29%5Cc2ccccc2C could not be loaded.