ERROR opening https://cactus.nci.nih.gov/chemical/structure/CNCc1ccc%28cc1%29c2%5BnH%5Dc3cc%28F%29cc4C%28%3DO%29NCCc2c34/file?format=sdf&get3d=True  -- CNCc1ccc%28cc1%29c2%5BnH%5Dc3cc%28F%29cc4C%28%3DO%29NCCc2c34 could not be loaded.