Using CC(=O)OC(C)=O, COC(=O)c1cc2c(c(N3CCCCS3(=O)=O)c1)CCN2 to produce COC(=O)c1cc2c(c(N3CCCCS3(=O)=O)c1)CCN2C(C)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.