adenosine pyrophosphate

Adenosine 5'-diphosphate (ADP) is a naturally occurring nucleotide derived from the dephosphorylation of ATP. Adenosine 5'-diphosphate is essential for cellular metabolism and induces platelet aggregation.

NAD+ (β-Nicotinamide Adenine Dinucleotide) is a coenzyme composed of ribosylnicotinamide 5'-diphosphate coupled to adenosine 5'-phosphate by pyrophosphate linkage. It is found widely in nature and is involved in numerous enzymatic reactions in which it serves as an electron carrier by being alternately oxidized (NAD+) and reduced (NADH).