Using Cc1nc2c(Cl)nc3ccccc3c2n1CC(C)(C)O, C=CS(C)(=O)=O to produce Cc1nc2c(Cl)nc3ccccc3c2n1CC(C)(C)OCCS(C)(=O)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.