ERROR opening https://cactus.nci.nih.gov/chemical/structure/CNC%28%3DO%29c1cc2c%28cn1%29%5BnH%5Dc3ccccc23/file?format=sdf&get3d=True  -- CNC%28%3DO%29c1cc2c%28cn1%29%5BnH%5Dc3ccccc23 could not be loaded.