['CC(C)C(C)NC(=O)CO', 'CN(C)c1nc2sc(C=O)cc2s1', 'CC(C)C(C)N', 'CN(C)c1nc2sc(C(=O)OCC=O)cc2s1', 'CC(=O)NC(C)C(C)C', 'CN(C)c1nc2sc(C(=O)O)cc2s1', 'CCC(C)C', 'CN(C)c1nc2sc(C(=O)OCC(N)=O)cc2s1', 'CNC', 'CC(C)C(C)NC(=O)COC(=O)c1cc2scnc2s1', 'CN(C)c1nc2sccc2s1', 'CC(C)C(C)NC(=O)COC=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1nc2sccc2s1.