['CC(C)C(N)C(=O)N(C)C', 'CN(CC=O)c1ccc(C#N)cn1', 'CNC', 'CC(C)C(C=O)NC(=O)CN(C)c1ccc(C#N)cn1', 'CC(C)CC(=O)N(C)C', 'CN(CC(N)=O)c1ccc(C#N)cn1', 'CNc1ccc(C#N)cn1', 'CC(=O)NC(C(=O)N(C)C)C(C)C', 'N#Cc1cccnc1', 'CNCC(=O)NC(C(=O)N(C)C)C(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccncc1.