Using CCCOc1cc(-c2nc(-c3ccc(C(=O)OC)o3)cs2)ccc1OC to produce CCCOc1cc(-c2nc(C3C=CC(=C=O)O3)cs2)ccc1OC, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.