Using CCOC(=O)C(F)(F)F, COc1cc2c(cc1OC)C(=O)CCS2 to produce COc1cc2c(cc1OC)C(=O)C(C(=O)C(F)(F)F)CS2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.