Using O=C1NC(=O)c2ccccc21, CC(C)(C)OC(=O)NCC(CNC(=O)OC(C)(C)C)OS(C)(=O)=O to produce CC(C)(C)OC(=O)NCC(CNC(=O)OC(C)(C)C)N1C(=O)c2ccccc2C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.