['CO', 'Cc1cc(CNC(=S)NC(C)C)no1', 'CCCOC', 'Cc1cc(CNC(N)=S)no1', 'Cc1cc(C)on1', 'COCC(C)NC(N)=S', 'Cc1ccno1', 'CNC(=S)NC(C)COC']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cnoc1.