7-Methylxanthine-d3 is deuterium labeled 7-Methylxanthine. 7-Methylxanthine, a methyl derivative of xanthine, is one of the purine components in urinary calculi[1][2].
References
[1] Russak EM, et al. Impact of Deuterium Substitution on the Pharmacokinetics of Pharmaceuticals. Ann Pharmacother. 2019 Feb;53(2):211-216. DOI:10.1177/1060028018797110 [2] Caubet MS, et al. Determination of urinary 13C-caffeine metabolites by liquid chromatography-mass spectrometry: the use of metabolic ratios to assess CYP1A2 activity. J Pharm Biomed Anal. 2004 Feb 4;34(2):379-89. DOI:10.1016/S0731-7085(03)00528-4
