Using CCOC(=O)c1sc(C(=O)OCC)c(O)c1O, OCC(F)(F)CO to produce CCOC(=O)c1sc(C(=O)OCC)c2c1OCC(F)(F)CO2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.