Using COC(=O)C1=Cc2cc(Br)ccc2N(CC(C)=O)CC1, OCCO to produce COC(=O)C1=Cc2cc(Br)ccc2N(CC2(C)OCCO2)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.