['CO', 'O=C/C=C/c1ccc(N2CCC3(CC2)OCCO3)c([N+](=O)[O-])c1', 'C1CC2(CCN1)OCCO2', 'COC(=O)/C=C/c1cccc([N+](=O)[O-])c1', 'COC(C)=O', 'Cc1ccc(N2CCC3(CC2)OCCO3)c([N+](=O)[O-])c1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(N2CCC3(CC2)OCCO3)cc1.