['CC(C)O', 'O=CCc1[nH]nc2ccccc12', 'CCC', 'O=C(O)Cc1[nH]nc2ccccc12', 'CC(=O)OC(C)C', 'c1ccc2n[nH]cc2c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2n[nH]cc2c1.