['O=CC[C@H]1CCOC1', 'Cc1noc(N)c1C', 'Cc1conc1C', 'NC(=O)C[C@H]1CCOC1', 'C1CCOC1', 'CC(=O)Nc1onc(C)c1C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(C[C@H]1CCOC1)Nc1ccno1.