Using CC(C)(C)OC(=O)CCN, O=C(O)CNC(=O)CNC(=O)CNC(=O)OCc1ccccc1 to produce CC(C)(C)OC(=O)CCNC(=O)CNC(=O)CNC(=O)CNC(=O)OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.