['CC=O', 'CNCC(=O)NC1CCN(C2CC2)C1', 'CC(=O)N(C)CC=O', 'NC1CCN(C2CC2)C1', 'CNC(C)=O', 'CC(=O)NC1CCN(C2CC2)C1', 'C1CCN(C2CC2)C1', 'CC(=O)N(C)CC(N)=O', 'C1CC1', 'CC(=O)N(C)CC(=O)NC1CCNC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCN(C2CC2)C1.