Synthesis and Characterization of Heterocyclic Seven Membered Rings from 2,3-Pyridine caroboxylic anhydride. IHJPAS [Internet]. 2017 Mar. 13 [cited 2024 May 4];29(2):421-36. Available from: https://jih.uobaghdad.edu.iq/index.php/j/article/view/139