['O=CC[C@H]1CCOC1', 'Cc1cc(C)nc(N)n1', 'Cc1cc(C)ncn1', 'NC(=O)C[C@H]1CCOC1', 'C1CCOC1', 'CC(=O)Nc1nc(C)cc(C)n1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(C[C@H]1CCOC1)Nc1ncccn1.