PROBLEM TO BE SOLVED: To provide compounds for use as agents to prevent, inhibit or treat AIDS.SOLUTION: This invention provides a compound represented by the formula (I), where formula II is pyridazine or the like; R, R' independently represent H, halogen, hydroxyl, fluoroalkyl or the like; n, n' independently represent 1, 2 or the like; and Z, X, Y, W, T or U independently represent N or C.【課題】AIDSを予防し、抑制し、又は治療する剤としての使用の為の化合物の提供。【解決手段】式(I)で表される化合物。[式IIはピリダジン等;R、R’は各々独立にH、ハロゲン、ヒドロキシル、フルオロアルキル等;n、n’は各々独立に1、2等;Z、X、Y、W、T又はUは各々独立にN又はC。【選択図】なし