['CCCSCC=O', 'CCOC1CCCNC1', 'CC', 'CCCSCC(=O)N1CCCC(O)C1', 'CCO', 'CCCSCC(=O)N1CCCCC1', 'CCC', 'CCOC1CCCN(C(=O)CS)C1', 'CCCS', 'CCOC1CCCN(C(C)=O)C1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCNCC1.