Using CCCCc1nc(CCCC)n(Cc2ccc(-c3ccccc3C(=O)OC)cc2)n1 to produce CCCCc1nc(CCCC)n(Cc2ccc(-c3ccccc3C(=O)O)cc2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.