['CO', 'CC(C=O)CN(C)C(=O)CNC(=O)c1cccs1', 'CNCC(C)C(=O)OC', 'O=CCNC(=O)c1cccs1', 'O=Cc1cccs1', 'COC(=O)C(C)CN(C)C(=O)CN', 'COC(=O)C(C)C', 'CNC(=O)CNC(=O)c1cccs1', 'NC(=O)c1cccs1', 'COC(=O)C(C)CN(C)C(C)=O', 'c1ccsc1', 'COC(=O)C(C)CN(C)C(=O)CNC=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccsc1.