['CC(C)(C)NCC=O', 'CN(C)c1ccc(N)cn1', 'CC(C)(C)N', 'CC(=O)Nc1ccc(N(C)C)nc1', 'CC(C)C', 'CN(C)c1ccc(NC(=O)CN)cn1', 'CNC', 'CC(C)(C)NCC(=O)Nc1cccnc1', 'CC(C)(C)NCC(N)=O', 'CN(C)c1ccccn1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccncc1.