Using CCOC(=O)[C@@H]1Cc2ccccc2CN1C(=O)[C@H](CCSCCNC(=O)OCc1ccccc1)NC(CCc1ccccc1)C(=O)O to produce NCCSCC[C@H](NC(CCc1ccccc1)C(=O)O)C(=O)N1Cc2ccccc2C[C@H]1C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.