['CC(C)(C)NCC=O', 'CSc1ccc(C(C)N)cc1', 'CC(C)(C)NCC(N)=O', 'CCc1ccc(SC)cc1', 'CC(C)(C)N', 'CSc1ccc(C(C)NC(C)=O)cc1', 'CC(C)C', 'CSc1ccc(C(C)NC(=O)CN)cc1', 'CSc1ccccc1', 'CCNC(=O)CNC(C)(C)C', 'CS', 'CC(NC(=O)CNC(C)(C)C)c1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.