Used as a stable isotope-labeled internal standard in analytical chemistry, particularly in mass spectrometry and liquid chromatography-tandem mass spectrometry (LC-MS/MS) methods. Enables accurate quantification of Ochratoxin A in food, feed, and biological samples by compensating for matrix effects and instrument variability. Commonly applied in mycotoxin monitoring programs to ensure food safety and regulatory compliance in commodities such as cereals, wine, coffee, and dried fruits. Also utilized in pharmacokinetic studies to track toxin metabolism and exposure in humans and animals.