“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” (2026) International Journal of Engineering Research and Science & Technology, 22(4(S), pp. 109–116. doi:10.62643/ijerst.2026.v22.n4(s).4807.