摘要
Secovironolide (1) was purified from the culture broth of Talaromyces wortmanni and is the first example of a furanosteroid scaffold bearing a five-membered B ring. The structure of 1 was elucidated by comprehensive NMR spectroscopy and single-crystal X-ray crystallography. Additional known viridian derivatives (2-5, 7) were isolated, including the new epoxide containing compound, epoxyvirone (6). Isolates were tested for monoamine oxidase (MAO) inhibitory activity and showed only weak activity.