5-Fluoro-L-tryptophan

25‑Hydroxyvitamin D₃ is the major circulating metabolite of vitamin D₃, produced in the liver, and is widely used in animal nutrition as a highly bioavailable source of vitamin D activity to support calcium metabolism, bone health, and overall performance in livestock and poultry.

7-Methyl-L-tryptophan is an organic compound that is a crystalline white solid. As a key precursor in the biosynthesis of nonribosomal peptide antibiotics, it participates in the synthesis of potent antibacterial agents and their analogues, and has application value in the field of anti‑infective research.