['CC(C)(C)O', 'N[C@@H]1C[C@H]1NC=O', 'N[C@@H]1C[C@H]1N', 'CC(C)(C)OC=O', 'CC(C)C', 'N[C@@H]1C[C@H]1NC(=O)O', 'NC1CC1', 'CC(C)(C)OC(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CC1.