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