Using CC(C)c1nccc(C(O)CN(CCO)C(=O)OC(C)(C)C)n1 to produce CC(C)c1nccc(C2CN(C(=O)OC(C)(C)C)CCO2)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.