ERROR opening https://cactus.nci.nih.gov/chemical/structure/C%5Bn%5D1cnc2N%28C%29C%28%3DO%29N%28C%29C%28%3DO%29c12/file?format=sdf&get3d=True -- C%5Bn%5D1cnc2N%28C%29C%28%3DO%29N%28C%29C%28%3DO%29c12 could not be loaded.