['O=C[C@H]1CCC(=O)N1', 'CC1(C)C(CN)C1(C)C', 'CC1C(C)(C)C1(C)C', 'NC(=O)[C@H]1CCC(=O)N1', 'O=C1CCCN1', 'CC1(C)C(CNC=O)C1(C)C', 'CC1(C)CC1(C)C', 'CNC(=O)[C@H]1CCC(=O)N1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C1CC[C@H](C(=O)NCC2CC2)N1.