text: Other industrial uses of thiourea include production of flame retardant resins, and vulcanization accelerators. 
  Thiourea is building blocks to pyrimidine derivatives. Thus, thioureas condense with β-dicarbonyl compounds. The amino group on the thiourea initially condenses with a carbonyl, followed by cyclization and tautomerization. Desulfurization delivers the pyrimidine. The pharmaceuticals thiobarbituric acid and sulfathiazole are prepared using thiourea. 4-Amino-3-hydrazino-5-mercapto-1,2,4-triazole is prepared by the reaction of thiourea and hydrazine.
  Thiourea is used as an auxiliary agent in diazo paper, light-sensitive photocopy paper and almost all other types of copy paper.
  It is also used to tone silver-gelatin photographic prints (see Sepia Toning).
  Thiourea is used in the Clifton-Phillips and Beaver bright and semi-bright electroplating processes. It is also used in a solution with tin(II) chloride as an electroless tin plating solution for copper printed circuit boards.
  Thioureas are used (usually as hydrogen-bond donor catalysts) in a research theme called thiourea organocatalysis. Thioureas are often found to be stronger hydrogen-bond donors (i.e., more acidic) than ureas.