benzoylecgonine

noun

ben·​zo·​yl·​ec·​go·​nine ˌben-zə-ˌwil-ˈek-gə-ˌnēn, -nən, -zō-ˌil-, -ˌzȯil- 

: a metabolite C₁₆H₁₉NO₄ of cocaine that is found in the blood and urine

Drug levels were determined from benzoylecgonine, a chemical by-product of cocaine found solely in the urine of users.

—Seed