['C#Cc1cccc(N)c1', 'CC(CO)CNC(=O)C=O', 'CC(CN)CO', 'C#Cc1cccc(NC(=O)C=O)c1', 'CC(C)CO', 'C#Cc1cccc(NC(=O)C(N)=O)c1', 'C#Cc1ccccc1', 'CC(CO)CNC(=O)C(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.