['C1CCNC1', 'C[C@@H](C=O)NC1CCCCC1', 'NC1CCCCC1', 'CCC(=O)N1CCCC1', 'C1CCCCC1', 'C[C@H](N)C(=O)N1CCCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(CNC1CCCCC1)N1CCCC1.