ERROR opening https://cactus.nci.nih.gov/chemical/structure/Cc1nc%5BnH%5Dc1CN2CCc4c%28C2%3DO%29c3ccccc3n4C/file?format=sdf&get3d=True  -- Cc1nc%5BnH%5Dc1CN2CCc4c%28C2%3DO%29c3ccccc3n4C could not be loaded.