Using Cc1csc(Nc2ncc(C(O)C3CCOCC3)cc2Sc2ccccc2)n1 to produce Cc1csc(Nc2ncc(C=C3CCOCC3)cc2Sc2ccccc2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.