Go here to see the spelling of benzene sulfinic acid in czech.

http://environmentalchemistry.com/yo...dihydrate.html

There is more doubt growing in my mind about this. Sulfinic acids and Sulfonic acids are distinct in Polish, Czech and all other languages I have researched.

One is -SO2H and the other is SO3H, and they differ in activity much as sulfite and sulfate do, thus explaining the antioxidant properties claimed for the Sulfinates in literature.

PE