Using On1nnc2ccccc21, CC(C)(C)OC(=O)NCCC[C@@H](NC(=O)OCC1c2ccccc2-c2ccccc21)C(=O)O to produce CCOC(=O)[C@@H](CCCNC(=O)OC(C)(C)C)NC(=O)OCC1c2ccccc2-c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.