['CC1CCC(N)CC1', 'COCCOCCC=O', 'CO', 'CCOCCC(=O)NC1CCC(C)CC1', 'CCOC', 'CC1CCC(NC(=O)CCO)CC1', 'COCCO', 'CCC(=O)NC1CCC(C)CC1', 'CC1CCCCC1', 'COCCOCCC(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCCCC1.