Using CCOC(=O)CN, CC(C)(CSCc1ccccc1)C(=O)N[C@H](CSCc1ccccc1)C(=O)O to produce CCOC(=O)CNC(=O)[C@@H](CSCc1ccccc1)NC(=O)C(C)(C)CSCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.