Using CCO, CCOC(=O)C(=C1SC(=S)N(CC(=O)O)C1=O)c1csc(NC(=S)Nc2ccc(Cl)cc2)n1 to produce CCOC(=O)CN1C(=O)C(=C(C(=O)OCC)c2csc(NC(=S)Nc3ccc(Cl)cc3)n2)SC1=S, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.