NAD+ (Nicotinamide Adenine Dinucleotide, oxidized form) is a coenzyme, a small organic molecule critical for cellular metabolism, particularly in redox reactions.
The structure can be described as:
Nicotinamide-ribose-5’-phosphate-5’-ribose-adenine
Nicotinamide: C6H5N2 (pyridinium ring with a carboxamide group).
Adenine: C5H5N5 (purine ring).
Pyrophosphate: -O-P(O)(OH)-O-P(O)(OH)-O- linking the two ribose 5’-carbons.
 
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