ERROR opening https://cactus.nci.nih.gov/chemical/structure/c4ccccc4NC%28%3DO%29C1%28CC1C2%3DNO%29Oc3ccccc23/file?format=sdf&get3d=True  -- c4ccccc4NC%28%3DO%29C1%28CC1C2%3DNO%29Oc3ccccc23 could not be loaded.