Using COC(=O)c1ccc2[nH]c(C3CCN(C(=O)c4ccc(-c5ccccc5)cc4)CC3)nc2c1 to produce O=C(O)c1ccc2[nH]c(C3CCN(C(=O)c4ccc(-c5ccccc5)cc4)CC3)nc2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.