['CC(C)O', 'O=CCOC(=O)c1c[nH]c2ccccc12', 'CC(C)OC(=O)CO', 'O=Cc1c[nH]c2ccccc12', 'CCC', 'O=C(O)COC(=O)c1c[nH]c2ccccc12', 'CC(=O)OC(C)C', 'O=C(O)c1c[nH]c2ccccc12', 'c1ccc2[nH]ccc2c1', 'CC(C)OC(=O)COC=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2[nH]ccc2c1.