['Nc1ncn[nH]1', 'CC(C)(C)SCC=O', 'CC(C)C', 'O=C(CS)Nc1ncn[nH]1', 'CC(C)(C)S', 'CC(=O)Nc1ncn[nH]1', 'c1nc[nH]n1', 'CC(C)(C)SCC(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1nc[nH]n1.