Aristolochene

Aristolochene is a bicyclic sesquiterpene produced by certain fungi including the cheese mold "Penicillium roqueforti". It is biosynthesized from farnesyl pyrophosphate by aristolochene synthase and is the parent hydrocarbon of a large variety of fungal toxins.
The substance was first isolated from "Penicillium roqueforti", a fungus used to make blue cheeses like Roquefort, Danish Blue, Stilton cheese and Gorgonzola.
Aristolochene is a precursor to the toxin known as PR toxin, made in large amounts by "Penicillium roqueforti". PR toxin has been implicated in incidents of mycotoxicoses resulting from eating contaminated grains.