Using O=Cc1cn(CCCCl)c(=O)c2ccc(Br)cc12, CC(=O)[O-] to produce CC(=O)OCCCn1cc(C=O)c2cc(Br)ccc2c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.