['NC=O', 'C[C@@H](N)C(=O)Nc1ccc(OCC#N)cc1', 'C[C@H](C=O)NC(N)=O', 'N#CCOc1ccc(N)cc1', 'CC#N', 'C[C@@H](NC(N)=O)C(=O)Nc1ccc(O)cc1', 'N#CCO', 'C[C@@H](NC(N)=O)C(=O)Nc1ccccc1', 'NC(N)=O', 'CCC(=O)Nc1ccc(OCC#N)cc1', 'C[C@@H](NC(N)=O)C(N)=O', 'N#CCOc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.