['CC(C)(C)O', 'CC(C)CC(=O)N1CCCC(CN(C)C=O)C1', 'CC(C)CC=O', 'CN(CC1CCCNC1)C(=O)OC(C)(C)C', 'CC(C)(C)OC=O', 'CNCC1CCCN(C(=O)CC(C)C)C1', 'CC(C)C', 'CC(C)CC(=O)N1CCCC(CN(C)C(=O)O)C1', 'CNC(=O)OC(C)(C)C', 'CC(C)CC(=O)N1CCCC(C)C1', 'CN(C)C(=O)OC(C)(C)C', 'CC(C)CC(=O)N1CCCCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCNCC1.