['CC(C)c1ccc(O)cc1', 'CC(C)(C)CC(=O)NCC=O', 'CC(C)(C)CC=O', 'CC(C)c1ccc(OC(=O)CN)cc1', 'CC(C)c1ccccc1', 'CC(C)(C)CC(=O)NCC(=O)O', 'CC(C)(C)CC(N)=O', 'CC(=O)Oc1ccc(C(C)C)cc1', 'CCC', 'CC(C)(C)CC(=O)NCC(=O)Oc1ccccc1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.