Using CC(C)(C)C(=O)OCCl, COc1cc(OC)nc(Sc2nccc(-c3ccc(F)cc3)c2C(=O)O)n1 to produce COc1cc(OC)nc(Sc2nccc(-c3ccc(F)cc3)c2C(=O)OCOC(=O)C(C)(C)C)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.