['CC=O', 'CC(C)[C@H](N)C(=O)Nc1ccc(N2CCOCC2)nc1', 'CC(=O)N[C@H](C=O)C(C)C', 'Nc1ccc(N2CCOCC2)nc1', 'CC(N)=O', 'CC(C)CC(=O)Nc1ccc(N2CCOCC2)nc1', 'C1COCCN1', 'CC(=O)N[C@H](C(=O)Nc1cccnc1)C(C)C', 'CC(=O)N[C@H](C(N)=O)C(C)C', 'c1ccc(N2CCOCC2)nc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(N2CCOCC2)nc1.