['CC(C)(C)N', 'CC(C)(C)C(=O)N1CCCC(C=O)C1', 'CC(C)(C)C=O', 'CC(C)(C)NC(=O)C1CCCNC1', 'CC(C)C', 'CC(C)(C)C(=O)N1CCCC(C(N)=O)C1', 'CC(C)(C)NC=O', 'CC(C)(C)C(=O)N1CCCCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCNCC1.