['CC(C)O', 'Cc1cc(Cl)c2cc(C=O)ccc2n1', 'CCC', 'Cc1cc(Cl)c2cc(C(=O)O)ccc2n1', 'CC(C)OC=O', 'Cc1cc(Cl)c2ccccc2n1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2ncccc2c1.