['CN', 'C[C@@H](C(=O)NC=O)N(C)Cc1cccc(C#N)c1', 'CNC=O', 'C[C@@H](C(N)=O)N(C)Cc1cccc(C#N)c1', 'CNC(N)=O', 'C[C@@H](C=O)N(C)Cc1cccc(C#N)c1', 'CCC(=O)NC(=O)NC', 'CNCc1cccc(C#N)c1', 'Cc1cccc(C#N)c1', 'CNC(=O)NC(=O)[C@H](C)NC', 'N#Cc1ccccc1', 'CNC(=O)NC(=O)[C@H](C)N(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.