Using O=C(O)C=Cc1ccc(CC2SCC(=O)N2CCC2(O)CCCCC2)cc1 to produce O=C(O)CCc1ccc(CC2SCC(=O)N2CCC2(O)CCCCC2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.