Gansu Zeyuan Biotechnology Co., Ltd. (Formerly Tengzhou Huichang Spice Co., Ltd.​) is located in Tengzhou, which is the production base of heterocyclic flavor and fragrance products in China. The company specializes in the production and operation of heterocyclic synthetic fragrances. Zeyuan Biotechnology adheres to the principle of honesty and integrity. Its business covers 20 or more countries and regions both at home and abroad, and has received unanimous praise from domestic and foreign customers. 

Zeyuan Biotechnology currently has over 100 kinds of heterocyclic fragrances. The main products include: 2.5-Dimethylpyrazine, 2.5-Dimethylpyrazine (monomer), 2.6-Dimethylpyrazine, Quinoxaline,5-methyl-, 2.3-Dimethylpyrazine, 2.3.5-Trimethylpyrazine, 2.3.5.6-Tetramethylpyrazine, 5.6.7.8-Tetrahydroquinoxaline, 2-Methyl-3-isobutyl pyrazine, 2-Methyl-3-sec-butyl pyrazine,etc. 

Gansu Zheyuan Biotechnology Co., Ltd. (Formerly Tengzhou Huichang Spice Co., Ltd. ​) will always be committed to the research and production of heterocyclic synthetic flavorings. With the highest goal of achieving mutual benefit for both parties, through honest and efficient work, we will jointly create the glorious future of the flavoring and aromatic materials industry with domestic and foreign users.