Using O=C(O)C(F)(F)F, O=C(CCCBr)c1ccc2[nH]c(=O)oc2c1 to produce O=C(OCCCCc1ccc2[nH]c(=O)oc2c1)C(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.