Using CCCBr, CCOC(=O)c1cc2c(-c3ccc(O)cc3C)nc(N)nc2s1 to produce CCCOc1ccc(-c2nc(N)nc3sc(C(=O)OCC)cc23)c(C)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.