Noun
ammonium bicarbonate (uncountable)
(inorganic chemistry) NH4HCO3; a white powder with properties similar to those of ammonium carbonate.
Ammonium bicarbonate is used in digestive biscuit manufacture. Source: Internet
From what I was taught in culinary school, ammonium bicarbonate isn’t even used that much in the food industry anymore, and according to various sources on the net–it is seldom used by food processors. Source: Internet
With the exception ammonium bicarbonate, the other two chemicals/food additives are naturally derived. Source: Internet