Using CCO, CCCCCCCCCCCc1cc2cc(C(=O)O)ccc2[nH]1 to produce CCCCCCCCCCCc1cc2cc(C(=O)OCC)ccc2[nH]1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.