Using O=C1CSC(=O)N1, COC(=O)c1ccc(OCCOc2ccc(C=O)cc2)cc1 to produce COC(=O)c1ccc(OCCOc2ccc(/C=C3/SC(=O)NC3=O)cc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.