Using COC(=O)c1ccc2ccn(CCNC(=O)OC(C)(C)C)c2c1 to produce CC(C)(C)OC(=O)NCCn1ccc2ccc(C(=O)O)cc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.