ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DCC%3DC%28O1%29S%28%3DO%29%28%3DO%29NO/file?format=sdf&get3d=True  -- CC1%3DCC%3DC%28O1%29S%28%3DO%29%28%3DO%29NO could not be loaded.