Using O=[Cr](=O)([O-])Cl, COC(=O)CCCCCC(c1ccc(F)cc1)c1c(O)c(C)c(C)c2c1CCC2 to produce Cc1c(C)c2c(c(C(CCCCCC(=O)O)c3ccc(F)cc3)c1O)CCC2=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.