ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC1NC%28%3DO%29CCC1N3Cc2c%28cccc2N%29C3%3DO/file?format=sdf&get3d=True  -- O%3DC1NC%28%3DO%29CCC1N3Cc2c%28cccc2N%29C3%3DO could not be loaded.