Using C=CC(=O)N(C)Cc1c(C)[nH]c2ccccc12, COCCN1Cc2cc(Br)cnc2NC1=O to produce COCCN1Cc2cc(/C=C/C(=O)N(C)Cc3c(C)[nH]c4ccccc34)cnc2NC1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.