Using COC(=O)C(NC(=O)c1ccc(C(=O)NCc2cccc(O)c2)cc1Br)P(=O)(OC)OC, Cc1nc(C=O)cs1 to produce COC(=O)/C(=C/c1csc(C)n1)NC(=O)c1ccc(C(=O)NCc2cccc(O)c2)cc1Br, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.