['Cn1cc(C=O)nn1', 'CNC[C@H]1CCCO1', 'C[C@H]1CCCO1', 'CNC(=O)c1cn(C)nn1', 'Cn1ccnn1', 'CN(C=O)C[C@H]1CCCO1', 'C1CCOC1', 'CN(C)C(=O)c1cn(C)nn1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(NC[C@H]1CCCO1)c1c[nH]nn1.