6- (L-1,2,3-Trihydroxybutyl) -pterin

6- (L-1,2,3-Trihydroxybutyl) -pterin is a derivative of L-biopterin and represents an oxidized form of tetrahydro-L-biopterin (BH4) as well as D-biopterin. Concurrent administration of 6- (L-1,2,3-Trihydroxybutyl) -pterin (0.5%) with the carcinogen 4-dimethylaminoazobenzene can reduce the incidence of liver tumors in rats induced by 4-dimethylaminoazobenzene. Furthermore, 6- (L-1,2,3-Trihydroxybutyl) -pterin has been utilized as an internal standard for quantifying biopterin and neopterin in rat plasma using LC-MS.