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