['Cc1cc(C=O)c(C)o1', 'NC(=O)C1CCNCC1', 'NC=O', 'Cc1cc(C(=O)N2CCCCC2)c(C)o1', 'Cc1ccc(C)o1', 'NC(=O)C1CCN(C=O)CC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(c1ccoc1)N1CCCCC1.