['CC(C)(C)N', 'CC(C=O)NS(=O)(=O)N1CCOCC1', 'CCC(=O)NC(C)(C)C', 'NS(=O)(=O)N1CCOCC1', 'CC(C)C', 'CC(NS(=O)(=O)N1CCOCC1)C(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1COCCN1.