ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCC%28%3DO%29N1CCN%28CC1%29CC%3DCC2%3DCC%3DCC%3DC2/file?format=sdf&get3d=True  -- CCCC%28%3DO%29N1CCN%28CC1%29CC%3DCC2%3DCC%3DCC%3DC2 could not be loaded.