ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28N1C%28%3DO%29c2ccccc2C1%3DO%29C%28%3DO%29c3ccccc3/file?format=sdf&get3d=True  -- CC%28N1C%28%3DO%29c2ccccc2C1%3DO%29C%28%3DO%29c3ccccc3 could not be loaded.