['CC(C)(C)O', 'O=CNC1CCCCC1NC(=O)CC(F)(F)F', 'CC(C)(C)OC=O', 'NC1CCCCC1NC(=O)CC(F)(F)F', 'O=CCC(F)(F)F', 'CC(C)(C)OC(=O)NC1CCCCC1N', 'CC(C)C', 'O=C(O)NC1CCCCC1NC(=O)CC(F)(F)F', 'CC(C)(C)OC(N)=O', 'O=C(CC(F)(F)F)NC1CCCCC1', 'NC(=O)CC(F)(F)F', 'CC(C)(C)OC(=O)NC1CCCCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CCCCC1.