Using CC(O)=S, COC(=O)C(CCCC(OC)OC)NC(=O)C(CCO)N1C(=O)c2ccccc2C1=O to produce COC(=O)C(CCCC(OC)OC)NC(=O)C(CCSC(C)=O)N1C(=O)c2ccccc2C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.