['CCC(C)N', 'CCC(CC)(CC(=O)Nc1ccc(C=O)cc1)C(=O)O', 'CCC(CC)(CC=O)C(=O)O', 'CCC(C)NC(=O)c1ccc(N)cc1', 'CCCC', 'CCC(CC)(CC(=O)Nc1ccc(C(N)=O)cc1)C(=O)O', 'CCC(CC)(CC(N)=O)C(=O)O', 'CCC(C)NC(=O)c1ccccc1', 'CCC(C)NC=O', 'CCC(CC)(CC(=O)Nc1ccccc1)C(=O)O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.