label: 4-amino-5-hydroxymethyl-2-methylpyrimidine diphosphatase activity
label_lc: 4-amino-5-hydroxymethyl-2-methylpyrimidine diphosphatase activity
description: "Catalysis of the reaction: 4-amino-5-hydroxymethyl-2-methylpyrimidine pyrophosphate + H2O = hydroxymethylpyrimidine phosphate + phosphate + H+."