Using CCOC(=O)CCl, Cc1csc(-c2n[nH]c(=O)n2CC(C)C)c1Cl to produce CCOC(=O)Cn1nc(-c2scc(C)c2Cl)n(CC(C)C)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.