What is one of the principal chemical compounds that living things use to store energy

ATP or Adenosine triphosphate is the chief compounds which are used by the living things to store energy.

Explanation:

ATP is the compound that captures the chemical energy released through the degradation of food. It stores the captured energy and releases it at the time of need experienced by the organism.

It is made up of adenine, ribose sugar, and a phosphate group. It is produced in a cell organelle called mitochondria through a process called respiration.