PolyOrg, Inc. specializes in chemical synthesis services for life science companies. Our list of products includes acids, coumarins, purines, fine chemicals and coupling reagents. Our PolyOrg sulfa (POS) is a new sulfur transfer reagent for the synthesis of oligonucleotide phosphorothioates. It is soluble and stable in anhydrous acetonirile. It is a yellow crystalline product with no foul smell.