ChEBI: Gibberellin A18 is a C20-gibberellin, initially identified in Lupinus luteus, that is gibberellin A12 in which extra hydroxy substituents are present at the 2beta- and 7alpha-positions. It has a role as a plant metabolite. It is a C20-gibberellin and a dicarboxylic acid. It is functionally related to a gibberellin A12.