['CC(C)(C)N', 'CCCn1cc(C)cn1', 'CC(C)C', 'CCCn1cc(CN)cn1', 'CCC', 'CC(C)(C)NCc1cn[nH]c1', 'CNC(C)(C)C', 'CCCn1cccn1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cn[nH]c1.