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