Used as a stable isotope-labeled internal standard in analytical chemistry for the accurate detection and quantification of patulin in food samples, particularly in fruit juices and fermented products. Its primary application lies in mass spectrometry and liquid chromatography-tandem mass spectrometry (LC-MS/MS) methods, where it helps correct for matrix effects and improves measurement precision. Due to its identical chemical behavior to native patulin but distinct mass signature, it enables reliable monitoring of patulin contamination in compliance with food safety regulations.