Tengzhou Yuantong Aroma Chemicals Co.,Ltd which is manufacturing of the heterocyclic sulphuretted aroma chemical annually in total .we have many kinds of products: Pyrazine,Thiazole,Furans,Pyrrole,Thiophene,Pyridine,Sulfide etc.under strict quality It owns R&D division and 3 processing lines, two sets of low temperature reaction facilities,.It actually has developed into one of the larger scale and best assortment in China flavor and food ingredients. control system of ISO9001 2000 and kosher certificate.Our products received highly appraise and recognize from our clients owe to the steady quality.good credit.and we sell very well both in domestic and abroad.It have more than hundred kinds of products . If there are any items in your interest, for more details such as Kosher Certificate, COA, please feel free to contact us now. Refer to more details about the cpmpamy and products, please kindly check with the web site.