Using O=C([O-])O, CC(C)(C)OC(=O)N[C@@](C)(CSCc1ccc(-c2ccc(-n3ccc4ccccc43)cc2)cc1)C(=O)[O-] to produce COC(=O)[C@@H](N)CSCc1ccc(-c2ccc(-n3ccc4ccccc43)cc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.