1 hydroxy 3 methoxy 2 (methoxymethyl) 9,10 anthraquinone 1,3 dihydroxy 2 methoxymethyl 9,10 anthraquinone 1,3 dimethoxy 2 methyl 9,10 anthraquione 2 methyl 3 methoxy 9,10 anthraquinone 7 tetraene 24 nor friedelane 29 oic acid methyl ester Ajisamat Anthraquinones Celastraceae Oxidized triterpenes Pharmacognostic features Prismatomeris glabra Rubiaceae Salacia macrophylla Salacia macrophylla Blume TJ Mechanical engineering and machinery Valeton anthraquinone article calcium oxalate column chromatography cytotoxicity medicinal plant netzahualocoyene netzahualocoyonol nonhuman pentacyclic triterpene petiole phytochemistry plant medicinal product plant parenchyma