['CC(C)[C@H](C=O)NC(N)=O', 'COc1ccccc1CN', 'NC=O', 'COc1ccccc1CNC(=O)[C@H](N)C(C)C', 'CO', 'CC(C)[C@@H](NC(N)=O)C(=O)NCc1ccccc1', 'COc1ccccc1C', 'CC(C)[C@@H](NC(N)=O)C(N)=O', 'NC(N)=O', 'COc1ccccc1CNC(=O)CC(C)C', 'COc1ccccc1', 'CNC(=O)[C@H](NC(N)=O)C(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.