Using CCOC(OCC)OCC, CC(C)(C)OC(=O)C[C@@H](C=O)NC(=O)[C@@H]1[C@H]2CC[C@H](C2)N1C(=O)OCc1ccccc1 to produce CCOC(OCC)[C@H](CC(=O)OC(C)(C)C)NC(=O)[C@@H]1[C@H]2CC[C@H](C2)N1C(=O)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.