Using C[C@@H](N)C(=O)OC(C)(C)C, COCc1nc(C(=O)O)c(OCc2ccccc2)c2ccc(Oc3ccccc3)cc12 to produce COCc1nc(C(=O)N[C@H](C)C(=O)OC(C)(C)C)c(OCc2ccccc2)c2ccc(Oc3ccccc3)cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.