Scaffold hopping strategy to derive 4‐hydroxy‐1‐alkyl‐2‐oxo‐1, 2‐dihydrothieno[2, 3‐b:4, 5‐b′]dipyridine‐3‐carbonylglycine derivatives as a novel hypoxia‐inducible factor prolyl hydroxylase domain inhibitor for the potential treatment of chronic kidney disease anemia. (19th January 2023)