3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-Heptadecafluoro-1-decanesulfonic Acid, Sodium Salt-13C2 is a labeled analog of 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-Heptadecafluoro-1-decanesulfonic Acid, Sodium Salt, which is a class of fluorinated chemical compound used in firefighting. It also acts as a reagent in the preparation of sulfonic acid compounds.