Using C#CCc1c(C)nc2c(OCc3ccc(C(=O)OCC)cc3)cccn12 to produce C#CCc1c(C)nc2c(OCc3ccc(C(=O)O)cc3)cccn12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.