['O=CC[C@H]1CCOC1', 'Cc1cc(=O)n(C)cc1N', 'NC(=O)C[C@H]1CCOC1', 'Cc1ccn(C)c(=O)c1', 'C1CCOC1', 'CC(=O)Nc1cn(C)c(=O)cc1C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(C[C@H]1CCOC1)Nc1ccc(=O)[nH]c1.