 The pyrophosphate bond is also sometimes referred to as a phosphoanhydride bond, a naming convention which emphasizes the loss of water that occurs when two phosphates form a new P-O-P bond, and which mirrors the nomenclature for anhydrides of carboylic acids.Pyrophosphates are found in ATP and other nucleotide triphosphates, which are very important in biochemistry.Pyrophosphates are prepared by heating phosphates, hence the name "pyro-"phosphate (from the ).