Using COc1c(C(=O)NC2CCNCC2)n(C)c2c1c(=O)n(CC(=O)c1ccccc1)c1ccccc21, OCCBr to produce COc1c(C(=O)NC2CCN(CCO)CC2)n(C)c2c1c(=O)n(CC(=O)c1ccccc1)c1ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.