['C1CCNCC1', 'CCC(CC)CN(CC)CCC=O', 'CCC(C)CC', 'CCNCCC(=O)N1CCCCC1', 'CC', 'CCC(CC)CNCCC(=O)N1CCCCC1', 'CCNCC(CC)CC', 'CCC(=O)N1CCCCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCNCC1.