ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCCN%28CCC%29CCc2c%5BnH%5Dc1cccc%28O%29c12/file?format=sdf&get3d=True  -- CCCN%28CCC%29CCc2c%5BnH%5Dc1cccc%28O%29c12 could not be loaded.