<http://schema.org/url>
<http://chemwiki.ucdavis.edu/Biological_Chemistry/Vitamins%2C_Cofactors_and_Coenzymes/Nicotinamide_Adenine_Dinucleotide>
<http://chemwiki.ucdavis.edu/Biological_Chemistry/Vitamins%2C_Cofactors_and_Coenzymes/Nicotinamide_Adenine_Dinucleotide>