D-5-Hydroxytryptophan

D-5-Hydroxytryptophan (D-5-HTP) is the D-isomer of 5-HTP and can be isolated from DL-5-hydroxytryptophan by continuous separation. Compared with intraperitoneal administration of L-5-Hydroxytryptophan, which can induce dose-dependent backward walking behavior in mice, D-5-Hydroxytryptophan has no significant effect on mouse behavior and is a negative control. D-5-Hydroxytryptophan is also a 5-HT ligand, capable of binding to the 5-HT site with affinity in the micromolar range[1][2][3].