ERROR opening https://cactus.nci.nih.gov/chemical/structure/COCCN%28C%28%3DO%29CCl%29c1c%28C%29cccc1C/file?format=sdf&get3d=True  -- COCCN%28C%28%3DO%29CCl%29c1c%28C%29cccc1C could not be loaded.