Using COC(=O)[C@@H]1CSCc2c(OC(C)=O)cc(OC(C)=O)c(C)c2C(=O)OC[C@H](NC(=O)OC(C)(C)C)C(=O)N1 to produce COC(=O)[C@@H]1CSCc2c(OC(C)=O)cc(OC(C)=O)c(C)c2C(=O)OC[C@H](N)C(=O)N1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.