['CC(C)(C)CC=O', 'NCC(=O)NS(=O)(=O)c1cccnc1', 'NS(=O)(=O)c1cccnc1', 'CC(C)(C)CC(=O)NCC=O', 'CC(C)(C)CC(N)=O', 'CC(=O)NS(=O)(=O)c1cccnc1', 'O=[SH](=O)c1cccnc1', 'CC(C)(C)CC(=O)NCC(N)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccncc1.