IBRAHIM, YEHIA ABDU, ATEF G. HANNA, M. HANiA. ELGAMAL, R. F. ALLAM, and KHALEDA. M. YOUSSEF. 1995. “?SYNTHESIS OF SOME NEW NITROGENOUS DERIVATIVES OF GLYCYRRHETIC ACID WITH POTENTIAL BIOLOGICAL ACTIVITY”. Biological Sciences - PJSIR 38 (3-4):101-7. https://v2.pjsir.org/index.php/biological-sciences/article/view/2447.