['CC(C)(C)O', 'COc1ccc(Br)cc1[C@@H](NC=O)C(=O)O', 'CC(C)(C)OC=O', 'COc1ccc(Br)cc1[C@@H](N)C(=O)O', 'CC(C)C', 'COc1ccc(Br)cc1[C@@H](NC(=O)O)C(=O)O', 'CO', 'CC(C)(C)OC(=O)N[C@@H](C(=O)O)c1cccc(Br)c1', 'CC(C)(C)OC(N)=O', 'COc1ccc(Br)cc1CC(=O)O', 'COc1ccc(Br)cc1', 'CC(C)(C)OC(=O)NCC(=O)O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.