['CC(C)(C)O', 'O=CNCCn1ccc2ccccc21', 'CC(C)(C)OC=O', 'NCCn1ccc2ccccc21', 'CC(C)C', 'O=C(O)NCCn1ccc2ccccc21', 'CC(C)(C)OC(N)=O', 'CCn1ccc2ccccc21', 'c1ccc2[nH]ccc2c1', 'CCNC(=O)OC(C)(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2[nH]ccc2c1.