['CCC(C)C=O', 'CCN(C)Cc1cccc(CN)c1', 'CCC(C)C(N)=O', 'CCN(C)Cc1cccc(C)c1', 'CCNC', 'CCC(C)C(=O)NCc1cccc(C)c1', 'CC', 'CCC(C)C(=O)NCc1cccc(CNC)c1', 'CCC(C)C(=O)NC', 'CCN(C)Cc1ccccc1', 'CCN(C)C', 'CCC(C)C(=O)NCc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.