Using O=C([O-])O, CCCCCCCCCCCCOC(=O)[C@@H](N)[C@@H](C)O to produce CCCCCCCCCCCCOC(=O)[C@@H](NC(=O)CCCCCCCCCCC)[C@@H](C)O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.