['CO', 'Cc1occc1CN(C)C(=S)NC(C)C', 'CCCOC', 'Cc1occc1CN(C)C(N)=S', 'Cc1ccoc1C', 'CNC(=S)NC(C)COC', 'Cc1ccco1', 'COCC(C)NC(=S)N(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccoc1.