What is the name of the high energy compound that cells use directly for fuel?

Adenosine triphosphate (is the answer) - It is a nucleotide, also called a nucleoside triphosphate, is a small molecule used in cells as a coenzyme. It is often called the "molecular unit of currency " of intracellular energy shift.

ATP, or adenosine triphosphate, is the most important high-energy compound. It is a nucleoside triphosphate, and its formula is C10H16N5O13P3.