['O=CCCl', 'Cc1c(N)c(C(=O)N(C)C)nn1C', 'CNC', 'Cc1c(NC(=O)CCl)c(C=O)nn1C', 'NC(=O)CCl', 'Cc1cc(C(=O)N(C)C)nn1C', 'CN(C)C=O', 'Cc1c(NC(=O)CCl)cnn1C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1cn[nH]c1.