Purity >98%. Atrazine mercapturate is a major, glutathione-derived metabolite of atrazine , an herbicide that is effective in controlling a broad range of weeds. Atrazine has been reported to cause cancer in certain laboratory animals, have diverse effects on the reproductive system in animals and humans, and disrupt the normal function of the endocrine system. Atrazine mercapturate is readily measured in urine samples.