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