ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%29NC%28%3DO%29NS%28%3DO%29%28%3DO%29c1cnccc1Nc2cc%28C%29ccc2/file?format=sdf&get3d=True  -- CC%28C%29NC%28%3DO%29NS%28%3DO%29%28%3DO%29c1cnccc1Nc2cc%28C%29ccc2 could not be loaded.