2S-Hydroxy-1R-iodo GA3 is an intermediate for the synthesis of 1,2-Epoxy GA3 (E589425), which is a derivative of Gibberellic Acid (G3774500), a hormone that is found in plants which promotes the growth and elongation of cells. Gibberellic acid acts as a plant growth regulator on account of its physiological and morphological effects in extremely low concentrations. Generally Gibberellic acid affects only the plant parts above the soil surface.