ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN%20%28C%29%28C%29CCOP%28O-%29%28%3DO%29OCC%28O%29CO/file?format=sdf&get3d=True  -- CN%20%28C%29%28C%29CCOP%28O-%29%28%3DO%29OCC%28O%29CO could not be loaded.