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