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