['CSCCC=O', 'Nc1n[nH]c(C(F)(F)F)n1', 'CS', 'CCC(=O)Nc1n[nH]c(C(F)(F)F)n1', 'CSCCC(N)=O', 'FC(F)(F)c1ncn[nH]1', 'FC(F)F', 'CSCCC(=O)Nc1nc[nH]n1']
The Murcko scaffold (minmal number of connected rings) of <smiles></smiles> is c1nc[nH]n1.