[EN] PROCESSES FOR PREPARING TETRAHYDROBIOPTERIN, AND ANALOGS OF TETRAHYDROBIOPTERIN [FR] PROCEDES DE PREPARATION DE TETRAHYDROBIOPTERINE ET D'ANALOGUES DE LA TETRAHYDROBIOPTERINE
[EN] PROCESSES FOR PREPARING TETRAHYDROBIOPTERIN, AND ANALOGS OF TETRAHYDROBIOPTERIN [FR] PROCEDES DE PREPARATION DE TETRAHYDROBIOPTERINE ET D'ANALOGUES DE LA TETRAHYDROBIOPTERINE