['CC(C)(C)O', 'NC(=O)C1CCN(CC=O)CC1', 'CC(C)C', 'NC(=O)C1CCN(CC(=O)O)CC1', 'CC(=O)OC(C)(C)C', 'NC(=O)C1CCNCC1', 'NC=O', 'CC(C)(C)OC(=O)CN1CCCCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCNCC1.