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