Using CC(C)(C)OC(=O)N1CCC(CCC(=O)N2CCCC(C(=O)NCCC(=O)O)C2)CC1 to produce O=C(O)CCNC(=O)C1CCCN(C(=O)CCC2CCNCC2)C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.