ERROR opening https://cactus.nci.nih.gov/chemical/structure/CCN%28C%28C%29C%29CCc1c%5BnH%5Dc2ccccc12/file?format=sdf&get3d=True  -- CCN%28C%28C%29C%29CCc1c%5BnH%5Dc2ccccc12 could not be loaded.