['CCC(CC)(CC=O)C(=O)O', 'NCc1ccccc1-n1ccnc1', 'Cc1ccccc1-n1ccnc1', 'CCC(CC)(CC(N)=O)C(=O)O', 'c1ccc(-n2ccnc2)cc1', 'CCC(CC)(CC(=O)NC)C(=O)O', 'c1c[nH]cn1', 'CCC(CC)(CC(=O)NCc1ccccc1)C(=O)O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(-n2ccnc2)cc1.