Epolones: Novel Sesquiterpene-Tropolones from Fungus OS-F69284 That Induce Erythropoietin in Human Cells

Abstract
In the course of our screening for small molecule modulators of erythropoietin gene expression, two novel sesquiterpene tropolones and pycnidone were isolated from a culture of OS-F69284 (ATCC 74390). Their structures were elucidated by extensive 1H and 13C NMR spectroscopic studies and chemical reactions. These compounds induced erythropoietin gene expression 5-fold at a concentration of 1−1.6 μM.