Using Cc1n[nH]c2ccc(-c3nncc(N4CCN[C@@H](Cc5ccccc5)C4)n3)cc12, OCCBr to produce Cc1n[nH]c2ccc(-c3nncc(N4CCN(CCO)[C@@H](Cc5ccccc5)C4)n3)cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.