Radicicol is an antifungal antibiotic that inhibits heat shock protein 90 (Hsp90) activity by binding to the ATP-binding pocket, subsequently suppressing cell transformation induced by src, ras and mos. Represses estrogen receptor transcriptional activity and inhibits angiogenesis. Radicicol also binds to and inhibits DNA topoisomerase type II proteins and GRP94 through an ATPase domain common to Hsp90. MW: 364.78. Purity ≥98%