['CC(N)C(N)=O', 'O=Cc1c[nH]cc1-c1ccc(Cl)s1', 'CCC(N)=O', 'NC(=O)c1c[nH]cc1-c1ccc(Cl)s1', 'CC(NC=O)C(N)=O', 'Clc1ccc(-c2cc[nH]c2)s1', 'Clc1cccs1', 'CC(NC(=O)c1cc[nH]c1)C(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1csc(-c2cc[nH]c2)c1.