['Cc1cc(N)no1', 'CC(C)C/C(N)=N/OCC=O', 'CC(C)C/C(N)=N/O', 'CC(=O)Nc1cc(C)on1', 'Cc1ccno1', 'CC(C)C/C(N)=N/OCC(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cnoc1.