Using C[Si](C)(C)CCOCn1c(CCCCO)nc2cc(Cl)c(Cl)cc21 to produce C[Si](C)(C)CCOCn1c(CCCC=O)nc2cc(Cl)c(Cl)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.