di-Ammonium oxalate

Ammonium oxalate, C₂H₈N₂O₄ – more commonly written as (NH₄)₂C₂O₄ – is an oxalate salt with ammonium (sometimes as a monohydrate). It is a colorless (white) salt under standard conditions and is odorless and non-volatile. It is the ammonium salt of oxalic acid, and occurs in many plants and vegetables.