Using COC(=O)C[C@H]1CC[C@H](c2ccc(NC(=O)CCNC(=O)c3ccc(-c4ccccc4)cc3)cc2)CC1 to produce O=C(O)C[C@H]1CC[C@H](c2ccc(NC(=O)CCNC(=O)c3ccc(-c4ccccc4)cc3)cc2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.