['CC(C)O', 'C[C@@H](C=O)n1cnc2ccccc21', 'CCC', 'C[C@@H](C(=O)O)n1cnc2ccccc21', 'CCC(=O)OC(C)C', 'c1ccc2[nH]cnc2c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2[nH]cnc2c1.