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Cyamelide is an amorphous white solid (HNCO)x and is the polymerisation product of cyanic acid together with its cyclic trimer cyanuric acid. It is a porcelain-like white substance which is absolutely insoluble in water.


  • G. Fischer, J. Geith, T. M. Klapötke, and B. Krumm (2002). "Synthesis, Properties and Dimerization Study of Isocyanic Acid" (PDF). Z. Naturforschung. 57b (1): 19–25.
  • Hantzsch A (1905). "Concerning cyamelide". Berichte der Deutschen Chemischen Gesellschaft: 1013–1021.