Probable toxin that belongs to the MSDIN-like toxin family responsible for a large number of food poisoning cases and deaths (PubMed:18025465). Processed by the macrocyclase-peptidase enzyme POPB to yield a toxic cyclic nonapeptide (PubMed:18025465). POPB first removes 10 residues from the N-terminus (By similarity). Conformational trapping of the remaining peptide forces the enzyme to release this intermediate rather than proceed to macrocyclization (By similarity). The enzyme rebinds the remaining peptide in a different conformation and catalyzes macrocyclization of the N-terminal 9 residues (By similarity). Belongs to the MSDIN fungal toxin family.