['CC(C)(C)O', 'N/C(CCN1CCN(C=O)CC1)=N/O', 'CC(C)(C)OC=O', 'N/C(CCN1CCNCC1)=N/O', 'CC(C)C', 'N/C(CCN1CCN(C(=O)O)CC1)=N/O', 'CC/C(N)=N\\O', 'CC(C)(C)OC(=O)N1CCNCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is C1CNCCN1.