Using O=C1CCC(=O)N1Br, COC=C(C(=O)OC)c1c(OC)ncnc1Oc1cccc(C)c1 to produce COC=C(C(=O)OC)c1c(OC)ncnc1Oc1cccc(CBr)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.