['CCC(C)C', 'O=C(O)c1cn(CCO)nn1', 'CC(C)CCO', 'CCn1cc(C(=O)O)nn1', 'O=CO', 'CC(C)CCOCCn1ccnn1', 'CCOCCC(C)C', 'O=C(O)c1c[nH]nn1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1c[nH]nn1.