Abscisic Acid R isomer, also known as (2R,3R,5R)-(+)-Abscisic acid, is a naturally occurring plant hormone that plays a critical role in various physiological processes. This compound is involved in regulating plant growth, development, and response to environmental stresses. Synonyms for Abscisic Acid R isomer include (2R,3R,5R)-5-(1-Hydroxyethyl)-3-methyl-2-(1H-pyrrol-1-yl)pent-2-enoic acid, (2R,3R,5R)-Abscisin II, and (2R,3R,5R)-Abscisic acid. These synonyms are commonly used to refer to the same compound, providing alternative names that researchers and plant scientists might encounter in scientific literature or research discussions.