['CC=O', 'Cc1ccc(SCCNC(=O)[C@H](N)C(C)C)cc1C', 'CC(=O)N[C@@H](C=O)C(C)C', 'Cc1ccc(SCCN)cc1C', 'CC(N)=O', 'Cc1ccc(SCCNC(=O)CC(C)C)cc1C', 'CCSc1ccc(C)c(C)c1', 'CC(=O)N[C@@H](C(N)=O)C(C)C', 'Cc1ccc(S)cc1C', 'CCNC(=O)[C@H](NC(C)=O)C(C)C', 'Cc1ccccc1C', 'CC(=O)N[C@@H](C(=O)NCCS)C(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.