label: 6-carboxy-5,6,7,8-tetrahydropterin synthase activity
label_lc: 6-carboxy-5,6,7,8-tetrahydropterin synthase activity
description: "Catalysis of the reaction: 7,8-dihydroneopterin triphosphate + H2O = 6-carboxy-5,6,7,8-tetrahydropterin + triphosphate + acetaldehyde + 2 H+."