Using O=Cc1ccccc1, COC(=O)c1ccc2[nH]c3c(c2c1)CN(C(=O)OC(C)(C)C)CC3 to produce COC(=O)c1ccc2[nH]c3c(c2c1)CN(Cc1ccccc1)CC3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.