DEVELOPMENT AND VALIDATION OF A SENSITIVE LC–MS METHOD FOR THE DETERMINATION OF FOUR POTENTIAL IMPURITIES (LAS-I, LAS-II AND THEIR REGIOISOMERS) IN LASMIDITAN DRUG SUBSTANCE AT PPM LEVELS. int. J. Eng. Res. Sci. Tech. [Internet]. 2026 Oct. 30 [cited 2026 Nov. 5];22(4(S):109-16. Available from: https://ijerst.org/index.php/ijerst/article/view/4807