ERROR opening https://cactus.nci.nih.gov/chemical/structure/CC%28C%29N%28CCC%29CCc2c%5BnH%5Dc1ccccc12/file?format=sdf&get3d=True  -- CC%28C%29N%28CCC%29CCc2c%5BnH%5Dc1ccccc12 could not be loaded.