Using O=C(O)c1ccccc1O, CN(CCN)CCNC(=O)OC(C)(C)C to produce CN(CCNC(=O)OC(C)(C)C)CCNC(=O)c1ccccc1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.