['COCCN', 'Cc1cc(C)n(C(C)C=O)n1', 'CO', 'CCNC(=O)C(C)n1nc(C)cc1C', 'CCOC', 'Cc1cc(C)n(C(C)C(N)=O)n1', 'Cc1cc(C)[nH]n1', 'CCC(=O)NCCOC']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cn[nH]c1.