['CC(C)(C)NCC=O', 'CC(C)c1nc2cc(N)ccc2o1', 'CC(C)(C)N', 'CC(=O)Nc1ccc2oc(C(C)C)nc2c1', 'CC(C)C', 'CC(C)c1nc2cc(NC(=O)CN)ccc2o1', 'CC(C)(C)NCC(N)=O', 'CC(C)c1nc2ccccc2o1', 'CCC', 'CC(C)(C)NCC(=O)Nc1ccc2ocnc2c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2ocnc2c1.