['CC1CC(N)C1', 'O=C[C@H]1CCCC(=O)N1', 'CC1CCC1', 'NC(=O)[C@H]1CCCC(=O)N1', 'O=C1CCCCN1', 'CC1CC(NC=O)C1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C1CCC[C@H](C(=O)NC2CCC2)N1.