['CC(C)(C)N', 'CCN(CC=O)C(=O)c1nc(Cl)ccc1Cl', 'O=Cc1nc(Cl)ccc1Cl', 'CCNCC(=O)NC(C)(C)C', 'CC', 'CC(C)(C)NC(=O)CNC(=O)c1nc(Cl)ccc1Cl', 'CC(=O)NC(C)(C)C', 'CCNC(=O)c1nc(Cl)ccc1Cl', 'CC(C)C', 'CCN(CC(N)=O)C(=O)c1nc(Cl)ccc1Cl', 'Clc1ccc(Cl)nc1', 'CCN(C=O)CC(=O)NC(C)(C)C']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccncc1.