Using CCCc1c(OCCCOc2cc(O)c(C(C)=O)cc2CC)ccc2c1OC(C(=O)OCC)CC2 to produce CCCc1c(OCCCOc2cc(O)c(C(C)=O)cc2CC)ccc2c1OC(C(=O)[O-])CC2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.