molecule - (physics and chemistry) the simplest structural unit of an element or compound

cocarboxylase, thiamine pyrophosphate - a coenzyme important in respiration in the Krebs cycle

coenzyme A - a coenzyme present in all living cells; essential to metabolism of carbohydrates and fats and some amino acids

NAD, nicotinamide adenine dinucleotide - a coenzyme present in most living cells and derived from the B vitamin nicotinic acid; serves as a reductant in various metabolic processes

NADP, nicotinamide adenine dinucleotide phosphate - a coenzyme similar to NAD and present in most living cells but serves as a reductant in different metabolic processes

triphosphopyridine nucleotide - a coenzyme of several enzymes

coenzyme Q, ubiquinone - any of several quinones that function as electron-carrying coenzymes