Wiktionary
performic acid
n. (context organic compound English) The simplest organic peracid H-CO-OOH that is used to cleave the disulfide links in peptides
Wikipedia
Performic acid
Performic acid (PFA) is an organic compound with the formula CHO. It is an unstable colorless liquid which can be produced by mixing formic acid with hydrogen peroxide. Owing to its oxidizing and disinfecting action, it is used in the chemical, medical and food industries.