['CC(C)(C)C=O', 'NCC(=O)NC1CCCCCCC1', 'NC1CCCCCCC1', 'CC(C)(C)C(=O)NCC=O', 'CC(C)(C)C(N)=O', 'CC(=O)NC1CCCCCCC1', 'C1CCCCCCC1', 'CC(C)(C)C(=O)NCC(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCCCCCC1.