ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC1%3DCC%3DC%28C%3DC1%29S%28%3DO%29%28%3DO%29O.C%28CO%5BN%2B%5D%28%3DO%29%5BO-%5D%29N/file?format=sdf&get3d=True  -- CC1%3DCC%3DC%28C%3DC1%29S%28%3DO%29%28%3DO%29O.C%28CO%5BN%2B%5D%28%3DO%29%5BO-%5D%29N could not be loaded.