Using CC(=O)OCC1=C(C(=O)O)N2C(=O)[C@@H](N)[C@H]2SC1, COCc1nc2nc(C)cc(S)n2n1 to produce COCc1nc2nc(C)cc(SCC3=C(C(=O)O)N4C(=O)C(N)[C@H]4SC3)n2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.