ERROR opening https://cactus.nci.nih.gov/chemical/structure/%5BO-%5D%20%5BN%2B%5D%28%3DO%29c1cnc%28n1CC%28O%29CCl%29C/file?format=sdf&get3d=True  -- %5BO-%5D%20%5BN%2B%5D%28%3DO%29c1cnc%28n1CC%28O%29CCl%29C could not be loaded.