ADP

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The ADP and inorganic phosphate are the reaction products of ATP hydrolysis. The charge density on ATP is larger than its hydrolysis product, ADP, and theoretical studies show that ATP is less solvated than ADP. Both of these factors make ADP more stable in solution than ATP.

For more information see Biochemistry Online: Chapter 8B -
ATP and Oxidative Phosphorylation Reactions

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Wire Frame
Phosphorus in Green
Carbons in Yellow
Hydrogens in Blue
Oxygens in Red

A map of the electrostatic potential of ADP is shown above.