(1'S)-Dehydropestalotin is a fungal metabolite that has been found inU. craterium.1
1.Ayer, W.A., Trifonov, L.S., Hutchison, L.J., et al.Metabolites from a wood-inhabiting cup fungus, Urnula crateriumNat. Prod. Lett.14(6)405-410(2000)