['CC=O', 'CN(CC(=O)NCCN)c1ccc(Br)cc1F', 'CC(=O)NCCN', 'CN(CC=O)c1ccc(Br)cc1F', 'CC(N)=O', 'CCNC(=O)CN(C)c1ccc(Br)cc1F', 'CCNC(C)=O', 'CN(CC(N)=O)c1ccc(Br)cc1F', 'CC(=O)NCCNC(C)=O', 'CNc1ccc(Br)cc1F', 'Fc1cccc(Br)c1', 'CNCC(=O)NCCNC(C)=O']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccccc1.