Product Description: L-Thyroxine-13C6,15N is the 13C6 ans 15N labeled L-Thyroxine (HY-18341)[1].
Formula: C6 13C9H11I4 15NO4
References: [1]Russak EM, et al. Impact of Deuterium Substitution on the Pharmacokinetics of Pharmaceuticals. Ann Pharmacother. 2019 Feb;53(2):211-230.