ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCN%28CC1%3DCC%28%3DCC%3DC1%29S%28%3DO%29%28%3DO%29/file?format=sdf&get3d=True  -- CCN%28CC1%3DCC%28%3DCC%3DC1%29S%28%3DO%29%28%3DO%29 could not be loaded.