ERROR opening https://cactus.nci.nih.gov/chemical/structure/CN1C%28%26%2361%3BO%29NC%28%26%2361%3BO%29c2c1ncn2C/file?format=sdf&get3d=True  -- CN1C%28%26%2361%3BO%29NC%28%26%2361%3BO%29c2c1ncn2C could not be loaded.