Abscisic acid (ABA) is a ubiquitous hormone that regulates plant growth, development and responses to environmental stresses, plays a crucial role in the plant's response to both biotic and abiotic stress. Treatment with low concentrations of abscisic acid ( 10 to 100 microM) induced an antioxidative defence response against oxidative damage, but a high concentration of ABA (1,000 microM) induced an excessive generation of AOS and led to an oxidative damage in plant cells. (+)-abscisic acid is the naturally occurring (1'S)-(+) enantiomer of abscisic acid. It is an important sesquiterpenoid plant hormone which acts as a regulator of plant responses to environmental stresses such as drought and cold. It has a role as a plant hormone and a plant metabolite. It is a conjugate acid of a (+)-abscisate. It is an enantiomer of a (-)-abscisic acid.

Arecaidine is a citraconoyl group.

GDP-L-fucose is a GDP-fucose in which the fucosyl residue has L-configuration. It is a conjugate acid of a GDP-L-fucose(2-).