Using CCC[C@H](CC1(C(=O)N[C@H](COCc2ccccc2)CC(=O)OCC)CCCC1)C(=O)O to produce CCC[C@H](CC1(C(=O)N[C@H](COCc2ccccc2)CC(=O)O)CCCC1)C(=O)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.