Using O=c1[nH]c(=O)n2c3c(cccc13)Sc1ccc(C(F)(F)F)cc1-2, OCCBr to produce O=c1c2cccc3c2n(c(=O)n1CCO)-c1cc(C(F)(F)F)ccc1S3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.