6,7-Dimethyl-5,6,7,8-tetrahydropterin (hydrochloride)
6, 7-dimethyl-5,6,7, 8-Tetrahydropterin hydrochloride is a synthetic analogue of tetrahydro-L-bioterin and is used as a cofactor required for the NOS isoforms, phenylalanine, tyrosine and tryptophan hydroxylases, and other enzymes.