Using CCOC(=O)CBr, CCOC(=O)CN(CCO)C(=O)OC(C)(C)C to produce CCOC(=O)COCCN(CC(=O)OCC)C(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.