Using CCCCCCCCCCCCCCCCO, O=C(O)c1ccc(-c2nnn[nH]2)nc1 to produce CCCCCCCCCCCCCCCCOC(=O)c1ccc(-c2nnn[nH]2)nc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.