1-Methylxanthine-d3
1-Methylxanthine-d3 is deuterated labeled 1-Methylxanthine (HY-W008449). 1-Methylxanthine, a caffeine derivative, is an essential human urinary metabolite of caffeine and theophylline (1,3-dimethylxanthine, TP). 1-Methylxanthine enhances the radiosensitivity of tumor cells.