['Cc1cc(C)cc(N)c1', 'CC(C)[C@@H](C=O)NC(N)=O', 'NC=O', 'Cc1cc(C)cc(NC(=O)[C@@H](N)C(C)C)c1', 'NC(N)=O', 'Cc1cc(C)cc(NC(=O)CC(C)C)c1', 'Cc1cccc(C)c1', 'CC(C)[C@H](NC(N)=O)C(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.