['CNC(=O)[C@H](C)O', 'Cc1cc(C)cc(C=O)c1', 'CN', 'Cc1cc(C)cc(C(=O)O[C@@H](C)C=O)c1', 'CCC(=O)NC', 'Cc1cc(C)cc(C(=O)O)c1', 'Cc1cccc(C)c1', 'CNC(=O)[C@H](C)OC=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.