Using CCOC(=O)CC(C)=O, OCCc1csc(-c2ccc(Cl)cc2)n1 to produce CCOC(=O)CC1(C)OCCc2nc(-c3ccc(Cl)cc3)sc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.