Using CCOC(=O)c1coc(-c2oc3cccc(OCCCN(C(=O)OCc4ccccc4)C(C)(C)C)c3c2C)n1 to produce CCOC(=O)c1coc(-c2oc3cccc(OCCCNC(C)(C)C)c3c2C)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.