A compound that provides a backup source of high-energy phosphate bonds after ATP stores are used up is:

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Creatine phosphate is a molecule found in muscle cells that can quickly provide a phosphate group to ADP (adenosine diphosphate) to form ATP (adenosine triphosphate) in situations where ATP stores are low. This process can provide a quick burst of energy for muscle contraction. Glycogen and fatty acids are sources of energy themselves, but do not directly provide high-energy phosphate bonds. Lipoprotein lipase is an enzyme involved in the breakdown of lipids for energy, but does not provide high-energy phosphate bonds.

A Compound That Provides a Backup Source of High-Energy Phosphate