(3ξ,4ξ,5ξ,6ξ,7ξ,11ξ) -3,6-Dihydroxy-8-oxo-9-eremophilene-12-oic acid

This phytotoxin, identified in Alternaria alternata ssp. tenuissima, is associated with apple fruit spots. It is used in plant pathology research for in vitro toxicity assays and in vivo studies on fungal pathogenicity and host-pathogen interactions in apple disease development.