Synthesis of N-Substituted 3-Chloro- 2-azetidinones for 2, 4-diamino-6- hydroxy pyrimidin. cbej [Internet]. 2023 Feb. 6 [cited 2025 Apr. 20];21(88):13-24. Available from: https://cbej.uomustansiriyah.edu.iq/index.php/cbej/article/view/9949