"They are probably the best known and most intensively researched mycotoxins in the world."

Ochratoxin is a mycotoxin that comes in three secondary metabolite forms, A, B, and C. All are produced by Penicillium and Aspergillus species. The three forms differ in that Ochratoxin B (OTB) is a nonchlorinated form of Ochratoxin A (OTA) and that Ochratoxin C (OTC) is an ethyl ester form of Ochratoxin A. Aspergillus ochraceus is found as a contaminant