The present invention relates to formula I compounds having antitumoural activities through, as one possible biological target, the molecular chaperone heat shock protein 90 (Hsp90) inhibition. The invention includes the use of such compounds in medicine, in relation to cancer disease as well as other diseases where an inhibition of Hsp90 is responsive, and the pharmaceutical compositions containing such compounds.本發明係有關透過,作為一種可行的生物靶,分子帶位子(molecular chaperone)熱休克蛋白90(Hsp90)抑制作用而具有抗腫瘤活性之式I化合物。本發明包括此等化合物在有關癌症及其他對Hsp90抑制作用有反應之疾病的醫學中之用途,及包含此等化合物之藥學組成物。