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. International Journal of Engineering Research and Science & Technology, [S. l.], v. 22, n. 4(S), p. 109–116, 2026. DOI: 10.62643/ijerst.2026.v22.n4(s).4807. Disponível em: https://ijerst.org/index.php/ijerst/article/view/4807. Acesso em: 5 nov. 2026.