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