['CNC(=S)NC', 'Cc1ccccc1-n1nc(C)c(C)c1C', 'CNC(=S)N(C)C', 'Cc1cc(C)n(-c2ccccc2C)n1', 'Cc1ccccc1', 'CNC(=S)N(C)Cc1c(C)n[nH]c1C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(-n2cccn2)cc1.