ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28%3DO%29CH-C%28%3DO%29C.CC%28%3DO%29CH-C%28%3DO%29C.Cr%202/file?format=sdf&get3d=True  -- CC%28%3DO%29CH-C%28%3DO%29C.CC%28%3DO%29CH-C%28%3DO%29C.Cr%202 could not be loaded.