['Cc1ccc(CN)cc1', 'CC(C)C(=O)NCCNC=O', 'CC(C)C(=O)NCCN', 'Cc1ccc(CNC=O)cc1', 'CC(C)C=O', 'Cc1ccc(CNC(=O)NCCN)cc1', 'Cc1ccc(C)cc1', 'CC(C)C(=O)NCCNC(N)=O', 'CCNC(=O)C(C)C', 'Cc1ccc(CNC(N)=O)cc1', 'CC(C)C(N)=O', 'CCNC(=O)NCc1ccc(C)cc1', 'Cc1ccccc1', 'CNC(=O)NCCNC(=O)C(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.