['C=CCN', 'C[C@H](NC=O)c1ccc(S(C)(=O)=O)cc1', 'C=CCNC=O', 'C[C@H](N)c1ccc(S(C)(=O)=O)cc1', 'C=CC', 'C[C@H](NC(N)=O)c1ccc(S(C)(=O)=O)cc1', 'C=CCNC(N)=O', 'CCc1ccc(S(C)(=O)=O)cc1', 'C=CCNC(=O)NCC', 'CS(=O)(=O)c1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.