['NC(=O)CSCC=O', 'CNc1cccc(C(C)C)c1', 'NC(=O)CS', 'CC(=O)N(C)c1cccc(C(C)C)c1', 'CC(N)=O', 'CC(C)c1cccc(N(C)C(=O)CS)c1', 'CC(C)c1ccccc1', 'CNC(=O)CSCC(N)=O', 'CCC', 'CN(C(=O)CSCC(N)=O)c1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.