Using Cc1ccc2[nH]c3cc(C(=O)O)ccc3c(=O)c2c1, CO to produce COC(=O)c1ccc2c(=O)c3cc(C)ccc3[nH]c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.