['Cc1ccsc1C', 'CC(C)NCC(N)=O', 'CC(N)=O', 'Cc1ccsc1CNC(C)C', 'CCC', 'Cc1ccsc1CNCC(N)=O', 'Cc1ccsc1', 'CC(C)N(C)CC(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccsc1.