['CC(C)NC(=O)CN', 'COc1cc(C)ccc1OCC=O', 'CC(C)N', 'COc1cc(C)ccc1OCC(=O)NCC=O', 'COc1cc(C)ccc1O', 'CC(=O)NCC(=O)NC(C)C', 'CO', 'Cc1ccc(OCC(=O)NCC(=O)NC(C)C)cc1', 'COc1cccc(C)c1', 'CC(C)NC(=O)CNC(=O)CO', 'CC(=O)NC(C)C', 'COc1cc(C)ccc1OCC(N)=O', 'CCC', 'COc1cc(C)ccc1OCC(=O)NCC(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.