ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCC%28%3DO%29N%28CC%28C%29N%28C%29CCc1ccccc1%29c1ccccc1/file?format=sdf&get3d=True  -- CCC%28%3DO%29N%28CC%28C%29N%28C%29CCc1ccccc1%29c1ccccc1 could not be loaded.