(4,Namido-Etheno)Nicotinamide 1,N6-Ethenoadenine Dinucleotide is a by-product during the synthesis of Nicotinamide 1,N6-Ethenoadenine Dinucleotide (N407735), a fluorescent analog of Nicotinamide Adenine Dinucleotide as a coenzyme for glutamate dehydrogenase.