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