Using COCCBr, CC(C)(C)OC(=O)N[C@@H](C(=O)O)c1ccc(O)cc1 to produce COCCOc1ccc([C@@H](NC(=O)OC(C)(C)C)C(=O)O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.