ATP (adenosine triphosphate) is made up of three main components:

1. Adenine: A nitrogenous base, one of the building blocks of DNA and RNA.

2. Ribose: A five-carbon sugar, also found in RNA.

3. Triphosphate group: This is a chain of three phosphate groups, connected to the ribose sugar. The bonds between these phosphate groups are high-energy bonds, and when broken, release energy that can be used by the cell.

So, the full structure of ATP is adenine-ribose-triphosphate.