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