Papyracillic acid isolated from Lachnum papyraceum and a Microsphaeropsis sp. is a ioactive 1,6-dioxaspiro[4,4]nonene derivative in equilibrium with the open-chain form, and related to the mycotoxin penicillic acid.

Papyracillic acid and its analogues have potential as nonselective herbicides of natural origin. 

It exists in an equilibrium of diastereomers.

Product References

• Papyracillic acid, a new penicillic acid analogue from the ascomycete Lachnum papyraceum, Rudong Shan, et al. Tetrahedron 52(30):10249-10254 (1996)

• Papyracillic acid, a phytotoxic 1,6-dioxaspiro[4,4]nonene produced by Ascochyta agropyrina Var. nana, a potential mycoherbicide for Elytrigia repens biocontrol, Evidente A, et al. J.Agric. Food Chem 57(23):11168-73 (2009)