['CC', 'CC(CO)NC(=S)Nc1ccccc1', 'CCO', 'CC(C)NC(=S)Nc1ccccc1', 'CCCOCC', 'NC(=S)Nc1ccccc1', 'c1ccccc1', 'CCOCC(C)NC(N)=S']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.