['CCO', 'C[C@@H](N)C(=O)N1CCC(C=O)CC1', 'C[C@@H](N)C=O', 'CCOC(=O)C1CCNCC1', 'CC', 'C[C@@H](N)C(=O)N1CCC(C(=O)O)CC1', 'CCOC=O', 'C[C@@H](N)C(=O)N1CCCCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCNCC1.