Using CN(CCCNC(=O)OCC1c2ccccc2-c2ccccc21)C(=O)OC(C)(C)C to produce CNCCCNC(=O)OCC1c2ccccc2-c2ccccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.