['CO', 'CCNC(=S)NC1CC1c1ccccc1', 'CCOC', 'NC(=S)NC1CC1c1ccccc1', 'COCCNC(N)=S', 'c1ccc(C2CC2)cc1', 'c1ccccc1', 'COCCNC(=S)NC1CC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(C2CC2)cc1.