ERROR opening https://cactus.nci.nih.gov/chemical/structure/c1/cc%5Cc/2%3Dc%28/cc%5Ccc/cc2%29/cc%5Cc1/file?format=sdf&get3d=True  -- c1/cc%5Cc/2%3Dc%28/cc%5Ccc/cc2%29/cc%5Cc1 could not be loaded.