Using O=C(O)C1(c2ccc(Cl)nc2)NC=CS1, CCOC(=O)c1csc(-c2ccc(Cl)nc2)n1 to produce COc1ccc(-c2nc(C(=O)O)cs2)cn1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.