['Cc1ccc(C=O)cc1F', 'CC(C)(C)C(=O)NCC(=O)NCCN', 'CC(C)(C)C(=O)NCC=O', 'Cc1ccc(C(=O)NCCN)cc1F', 'CC(C)(C)C=O', 'Cc1ccc(C(=O)NCCNC(=O)CN)cc1F', 'Cc1ccc(C(N)=O)cc1F', 'CCNC(=O)CNC(=O)C(C)(C)C', 'CC(C)(C)C(=O)NCC(N)=O', 'CCNC(=O)c1ccc(C)c(F)c1', 'CC(C)(C)C(N)=O', 'CC(=O)NCCNC(=O)c1ccc(C)c(F)c1', 'Cc1ccccc1F', 'CC(C)(C)C(=O)NCC(=O)NCCNC=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.