['CO', 'O=CCCCCCCNC(=O)Cc1[nH]nc2ccccc12', 'COC(=O)CCCCCCN', 'O=CCc1[nH]nc2ccccc12', 'CCCCCCC(=O)OC', 'NC(=O)Cc1[nH]nc2ccccc12', 'c1ccc2n[nH]cc2c1', 'COC(=O)CCCCCCNC(C)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2n[nH]cc2c1.