ERROR opening https://cactus.nci.nih.gov/chemical/structure/O%3DC%28%5BO-%5D%29C%28F%29%28F%29F.%5BAg%2B%5D/file?format=sdf&get3d=True  -- O%3DC%28%5BO-%5D%29C%28F%29%28F%29F.%5BAg%2B%5D could not be loaded.