Using CC(C)(C)OC(=O)NCC(=O)O, C[C@H](NC(=O)CNC(=O)OC(C)(C)C)C(=O)N1CCC[C@H]1C(=O)OCc1ccccc1 to produce C[C@H](NC(=O)CNC(=O)CNC(=O)OC(C)(C)C)C(=O)N1CCC[C@H]1C(=O)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.