 The remainder has been identified as cyanuric acid, ammelide and ammeline, with crystals recovered from urine reported to be approximately 70% cyanuric acid.While some researchers have theorized the three latter chemicals might have been formed as the animals metabolized the melamine, or as byproducts of bacterial metabolism (cyanuric acid is a known intermediate byproduct of bacterial metabolism of melamine), their presence in the crystals found in contaminated protein itself, combined with media reports of widespread adulteration with both melamine and cyanuric acid in China, has focused research efforts on their combined effects in animals.Neither melamine nor cyanuric acid, a chemical commonly used in pool chlorination, have been thought to be particularly toxic by themselves.