https://en.m.wikipedia.org/wiki/Calcium_hypochlorite

https://en.m.wikipedia.org/wiki/Trichloroisocyanuric_acid

https://en.m.wikipedia.org/wiki/Cyanuric_chloride

https://en.m.wikipedia.org/wiki/Isocyanic_acid

Synthesis

Cyanuric acid (CYA) was first synthesized by Friedrich Wöhler in 1829 by the thermal decomposition of urea and uric acid (Urine). The current industrial route to CYA entails the thermal decomposition of urea, with release of ammonia.

https://www.myrecipes.com/how-to/can-you-mix-bleach-and-vinegar