Andrographis: A plant genus of the family ACANTHACEAE. Members contain andrographolide and other DITERPENES and androechin, a CHALCONE.Orthosiphon: A plant genus of the family LAMIACEAE that contains pimarane-type diterpenes. Several species of Orthosiphon are also called Java tea.Diterpenes: Twenty-carbon compounds derived from MEVALONIC ACID or deoxyxylulose phosphate.Phytochemicals: A broad range of biologically active compounds which occur naturally in plants having important medicinal and nutritional properties.Hedyotis: A plant genus of the family RUBIACEAE. Members contain anthraquinones and iridoids. H. diffusa is used in DRUGS, CHINESE HERBAL.Plant Extracts: Concentrated pharmaceutical preparations of plants obtained by removing active constituents with a suitable solvent, which is evaporated away, and adjusting the residue to a prescribed standard.Plant Structures: The parts of plants, including SEEDS.Succinic Anhydrides: A subclass of anhydrides with the general structure of dihydrofurandione. They can be substituted on any carbon atom. They modify and inhibit proteins and enzymes and are used in the acylation of amino- and hydroxyl groups.GlucosidesTetrahydronaphthalenes: Partially saturated 1,2,3,4-tetrahydronaphthalene compounds.