['NCCCC(N)=O', 'O=CC1(c2ccc(F)cc2)CCCCC1', 'CCCC(N)=O', 'NC(=O)C1(c2ccc(F)cc2)CCCCC1', 'NC(=O)CCCNC=O', 'Fc1ccc(C2CCCCC2)cc1', 'Fc1ccccc1', 'NC(=O)CCCNC(=O)C1CCCCC1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1ccc(C2CCCCC2)cc1.