ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCN%28CC%29C%28%3DO%29CCN%28C%29C1Cc3cccc2ncc%28C1%29c23/file?format=sdf&get3d=True  -- CCN%28CC%29C%28%3DO%29CCN%28C%29C1Cc3cccc2ncc%28C1%29c23 could not be loaded.