ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28CO%29%28CO%29NCc1cc2c3ccccc3ccc2c4c1cccc4/file?format=sdf&get3d=True  -- CC%28CO%29%28CO%29NCc1cc2c3ccccc3ccc2c4c1cccc4 could not be loaded.