7-Methylxanthine, a methyl analogue of xanthine, is one of the purine components in urinary calculi. References: 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.

纯度：≥98%

CAS：552-62-5