Wikipedia
Biurea
Biurea is a chemical compound with the molecular formula CHNO. It is produced in food products containing azodicarbonamide, a common ingredient in bread flour, when they are cooked. Upon exposure, biurea is rapidly eliminated from the body through excretion.
Biurea is produced from urea and hydrazine. Its major use is as a chemical intermediate in the production of azodicarbonamide.