['C1COCCN1', 'CSc1ccc(/C=C(/C#N)C=O)cc1', 'CSc1ccc(C)cc1', 'N#CCC(=O)N1CCOCC1', 'CS', 'N#C/C(=C/c1ccccc1)C(=O)N1CCOCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(C=Cc1ccccc1)N1CCOCC1.