['CC(N)C(=O)NC(C)(C)C', 'O=CC1C2CC3CC(C2)CC1C3', 'CC(C)(C)N', 'CC(C=O)NC(=O)C1C2CC3CC(C2)CC1C3', 'CCC(=O)NC(C)(C)C', 'NC(=O)C1C2CC3CC(C2)CC1C3', 'CC(C)C', 'CC(NC(=O)C1C2CC3CC(C2)CC1C3)C(N)=O', 'C1C2CC3CC1CC(C2)C3', 'CC(NC=O)C(=O)NC(C)(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1C2CC3CC1CC(C2)C3.