['CCCCN', 'CC1CCC(C=O)CN1CC#N', 'CCCC', 'CC1CCC(C(N)=O)CN1CC#N', 'CC#N', 'CCCCNC(=O)C1CCC(C)NC1', 'CCCCNC=O', 'CC1CCCCN1CC#N']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCNCC1.