['O=CCCl', 'COc1ccccc1-c1nnc(N)s1', 'CO', 'O=C(CCl)Nc1nnc(-c2ccccc2)s1', 'NC(=O)CCl', 'COc1ccccc1-c1nncs1', 'COc1ccccc1', 'O=C(CCl)Nc1nncs1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(-c2nncs2)cc1.