2,4-Diamino-6-hydroxypyrimidine/2,4-二氨基-6-羟基嘧啶
2,4-Diamino-6-hydroxypyrimidine (DAHP) is a selective and specific inhibitor of GTP cyclohydrolase I, the rate limiting step for de novo pterin synthesis, with IC50 about 0.3 mM for inhibition of BH4 biosynthesis in HUVEC cells.