Using C[Si](C)(C)c1cc(CCC(=O)O)co1, OCCCc1cc(F)c(F)cc1F to produce C[Si](C)(C)c1cc(CCC(=O)OCCCc2cc(F)c(F)cc2F)co1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.