1-Methylxanthine 是咖啡因衍生物，是咖啡因和茶碱 (1,3-二甲基黄嘌呤，TP) 在人体尿代谢产物，能够提高肿瘤细胞的放射敏感性。

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

1-Methylxanthine exhibits similar activities to other naturally occurring methylxanthines. Unlike caffeine and theobromine, 3-Methylxanthine, and 1-methylxanthine do not occur naturally at high levels in plants. 1-Methylxanthine (3 mM; for 30 min) increases the radiation-induced clonogenic and apoptotic cell (RKO human colorectal cancer cells carrying wild type protein 53 kDa (p53)) death.

6136-37-4

C6H6N4O2

166.14

DMSO:20 mg/ml (120.38 mM)
Powder: -20°C for 3 years
In solvent: -80°C for 2 years