Using CCOC(=O)c1csc(-c2ccc3c(ccn3C(=O)OC(C)(C)C)c2)n1 to produce CC(C)(C)OC(=O)n1ccc2cc(-c3nc(C(=O)O)cs3)ccc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.