['CNC', 'O=Cc1ccc(-c2ccccn2)[nH]c1=O', 'CN(C)C=O', 'O=c1cccc(-c2ccccn2)[nH]1', 'c1ccncc1', 'CN(C)C(=O)c1ccc[nH]c1=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=c1cccc(-c2ccccn2)[nH]1.