['CC(C)(C)C=O', 'NCC(=O)NCCc1ccc(S(N)(=O)=O)cc1', 'CC(C)(C)C(=O)NCC=O', 'NCCc1ccc(S(N)(=O)=O)cc1', 'CC(C)(C)C(N)=O', 'CC(=O)NCCc1ccc(S(N)(=O)=O)cc1', 'CC(C)(C)C(=O)NCC(N)=O', 'CCc1ccc(S(N)(=O)=O)cc1', 'NS(=O)(=O)c1ccccc1', 'CCNC(=O)CNC(=O)C(C)(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.