1240-37-5 Di-1-naphthylthiourea N,N'-Di-.alpha.-naphthylthiourea NSC74417 Thiourea, N,N'-di-1-naphthalenyl- Urea, 1,3-bis(1-naphthyl)-2-thio- Urea, 1,3-di-1-naphthyl-2-thio- WLN: L66J BMYUS&M- BL66J