Using COC(=O)C(CCBr)Oc1ccc2c(c1)OCCn1cc(-c3nc(C)nn3C(C)C)nc1-2 to produce COC(=O)C1(Oc2ccc3c(c2)OCCn2cc(-c4nc(C)nn4C(C)C)nc2-3)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.