(2Z,4E)-5-[(1S)-3-(Hexylthio)-1-hydroxy-2,6,6-trimethyl-4-oxo-2-cyclohexen-1-yl]-3-methyl-2,4-pentadienoic Acid-d13 is the isotope labelled analog of (2Z,4E)-5-[(1S)-3-(Hexylthio)-1-hydroxy-2,6,6-trimethyl-4-oxo-2-cyclohexen-1-yl]-3-methyl-2,4-pentadienoic Acid (H298050); an analog of Abscisic Acid (A110000) designed as an antagonist of PYL-PP2C receptor interactions.