['Nc1ncn[nH]1', 'CC(C)=C[C@@H]1[C@@H](C=O)C1(C)C', 'c1nc[nH]n1', 'CC(C)=C[C@@H]1[C@@H](C(N)=O)C1(C)C', 'O=CNc1ncn[nH]1', 'CC(C)=C[C@@H]1CC1(C)C', 'CCC', 'C[C@@H]1[C@@H](C(=O)Nc2ncn[nH]2)C1(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is O=C(Nc1ncn[nH]1)C1CC1.