Pyruvic acid is the main product of glycolysis. Its oxidative decarboxylation to acetylcoenzyme A prepares its entry into the citric acid cycle (Krebs cycle).
1 Pyruvate 2 Thiaminepyrophosphate (TPP) 3 Acyl-TPP 4 Lipoylamide 5 Amide of acyllipoate 6 Dihydrolipoylamide 7 Coenzyme A 8 Acetylcoenzyme A
For glycolysis see → here For details on the role of NAD + see → here For details on the role of the FAD see → here For the Krebs cycle see → here