ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1cc2c3c%28ccc4c3c1C%28%3DO%29NC4%3DO%29C%28%3DO%29NC2%3DO/file?format=sdf&get3d=True  -- c1cc2c3c%28ccc4c3c1C%28%3DO%29NC4%3DO%29C%28%3DO%29NC2%3DO could not be loaded.