Using N#Cc1cnc2cc(O)c(O)cc2c1Nc1cccc(Br)c1, ClCBr to produce N#Cc1cnc2cc3c(cc2c1Nc1cccc(Br)c1)OCO3, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.