Using CCOC(=O)[C@H](CCCCN1C(=O)c2ccccc2C1=O)N[C@H]1CSc2ccccc2N(CC(=O)OC(C)(C)C)C1=O to produce CCOC(=O)[C@H](CCCCNC(C)=O)N[C@H]1CSc2ccccc2N(CC(=O)OC(C)(C)C)C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.