Using CC(C)C[C@H](O)[C@H](O)[C@H](CC1CCCCC1)NC(=O)[C@@H](CC(=O)O)Cc1csc(NC(=O)OCC(Cl)(Cl)Cl)n1, O to produce O=C(O)C[C@@H](Cc1csc(NC(=O)OCC(Cl)(Cl)Cl)n1)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.