['CN', 'Cc1ccc(CN(CC=O)C(C)C)s1', 'CNC(C)=O', 'Cc1ccc(CNC(C)C)s1', 'Cc1ccc(C)s1', 'CNC(=O)CNC(C)C', 'CCC', 'CNC(=O)CNCc1ccc(C)s1', 'Cc1cccs1', 'CNC(=O)CN(C)C(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccsc1.