A diterpenoid is a member of a structurally diverse class of C20 terpenoid natural products whose carbon frameworks are biosynthetically derived predominantly from geranylgeranyl diphosphate (GGPP) and are associated with four isoprenyl units ^[1]. In plants, diterpenoid formation commonly begins with enzyme-catalyzed cyclization or rearrangement of GGPP by diterpene synthases, producing characteristic hydrocarbon or oxygenated scaffolds with acyclic, bicyclic, tricyclic, tetracyclic, or macrocyclic architectures ^[1][2][3]. These primary scaffolds undergo subsequent enzymatic elaboration involving reactions such as hydroxylation, oxidation, reduction, glycosylation, acylation, and other modifications that generate the molecular diversity of naturally occurring plant diterpenoids ^[2][3]. Their defining molecular scope therefore includes the twenty-carbon terpenoid framework, its biosynthetic derivation from isoprenoid precursors, scaffold formation through diterpene-synthase chemistry, and the resulting structural elaboration produced by downstream biosynthetic enzymes ^[1][2][3]. Within bioactive natural diterpenoid research, the term encompasses the molecular structures, biosynthetic pathways, and enzymatically generated chemical forms constituting this class of specialized plant metabolites ^[2][3].