our company is specialized in producing tryptophan product line. It owns powerful technology force, independent development ability of new products, and can provide high-quality products and perfect technical service for every client. The main products include: L-tryptophan, D-tryptophan, DL-tryptophan , N-Acetyl-DL-tryptophan, Especially, L-tryptophan and D-tryptophan are the leading products. Based on the mutual benefit and common interest, we warmly welcome all friends from home and abroad to...