ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28%3DO%29Oc2cccc1%5BnH%5Dcc%28CCN%28C%29C%29c12/file?format=sdf&get3d=True  -- CC%28%3DO%29Oc2cccc1%5BnH%5Dcc%28CCN%28C%29C%29c12 could not be loaded.