ERROR opening https://cactus.nci.nih.gov/chemical/structure/c2%28%5CC%26%2361%3BC%5Cc1ccccc1%29ccccc2/file?format=sdf&get3d=True  -- c2%28%5CC%26%2361%3BC%5Cc1ccccc1%29ccccc2 could not be loaded.