Summary: Sapropterin is a naturally occurring cofactor for phenylalanine hydroxylase. Under the trade name Kuvan, sapropterin dihydrochloride is approved for the treatment of hyperphenylalaninaemia and tetrahydrobiopterin deficiency. https://www.bocsci.com/sapropterin-dihydrochloride-cas-69056-38-8-item-97081.html