Using CCOC(=O)[C@@H]1Cc2cccnc2N1C(=O)[C@@H](N)C1CCOCC1, C[C@@H](C(=O)O)N(C)C(=O)OC(C)(C)C to produce CCOC(=O)[C@@H]1Cc2cccnc2N1C(=O)[C@@H](NC(=O)[C@H](C)N(C)C(=O)OC(C)(C)C)C1CCOCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.