['CC=O', 'CC(C)[C@@H](N)C(=O)Nc1nc2cc(Cl)ccc2s1', 'CC(=O)N[C@@H](C=O)C(C)C', 'Nc1nc2cc(Cl)ccc2s1', 'CC(N)=O', 'CC(C)CC(=O)Nc1nc2cc(Cl)ccc2s1', 'Clc1ccc2scnc2c1', 'CC(=O)N[C@@H](C(N)=O)C(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc2scnc2c1.