['Cc1cccc(N)c1', 'CC(C)(C)C(CCO)NC=O', 'CC(C)(C)C(N)CCO', 'Cc1cccc(NC=O)c1', 'CC(C)(C)CCCO', 'Cc1cccc(NC(N)=O)c1', 'Cc1ccccc1', 'CC(C)(C)C(CCO)NC(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.