alpha-naphthylthiourea

α-naph·thyl·thi·o·u·re·a (ANTU),

(naf'thil-thī'ō-yū-rē'ă), A derivative of thiourea; a highly toxic antithyroid agent, especially to small mammals, causing pulmonary edema, fatty degeneration of the liver, and low body temperature; used as a rat poison.