The present application describes organic compounds that inhibit the activity of the cytoplasmic heat shock protein Hsp90. Also described are methods useful for the prevention, treatment or amelioration of symptoms of diseases or conditions that respond to inhibition of Hsp90 activity, such as neurological diseases, proliferative disorders, and infections. [Selection figure] None本出願は、細胞質のヒートショックタンパク質Hsp90の活性を阻害する有機化合物を記載する。神経性疾患、増殖性障害、及び感染などのHsp90活性の阻害に応答する疾患又は状態の症状の予防、治療又は改善に有用な方法も記載される。【選択図】なし