['CC(C)CN', 'NC(=O)C1CCN(C=O)CC1', 'CC(C)CNC=O', 'NC(=O)C1CCNCC1', 'CC(C)C', 'NC(=O)C1CCN(C(N)=O)CC1', 'NC=O', 'CC(C)CNC(=O)N1CCCCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCNCC1.