Using CC(=O)NCCC(=O)O, COC(=O)CC(CSCCN)C(=O)c1cccnc1 to produce COC(=O)CC(CSCCNC(=O)CCNC(C)=O)C(=O)c1cccnc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.