Which ingredients are chemical preservatives listed below ?

Enriched flour (wheat flour, niacin, reduced iron, thiamin mononitrate [vitamin B1], riboflavin [vitamin B2], folic acid), peanut er (roasted peanut), partially hydrogenated soybean and/or cottonseed oil, sugar, high fructose corn syrup, dextrose, salt, malted barley flour, leavening (baking soda, monocalcium phosphate, sodium acid pyrophosphate), soy lecithin, cornstarch, sodium sulfite, cheddar cheese (milk, cheese, cultures, salt enzymes), yellow #6, red pepper, ermilk, whey, disodium phosphate