['CC(C)C=O', 'CN(C)c1ccc(C(=O)NCCN)cc1F', 'CC(C)C(=O)NCCN', 'CN(C)c1ccc(C=O)cc1F', 'CC(C)C(N)=O', 'CCNC(=O)c1ccc(N(C)C)c(F)c1', 'CCNC(=O)C(C)C', 'CN(C)c1ccc(C(N)=O)cc1F', 'CNC', 'CC(C)C(=O)NCCNC(=O)c1cccc(F)c1', 'CN(C)c1ccccc1F', 'CC(C)C(=O)NCCNC=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.