Chemical constituents and their antitumor cytotoxic activity in leaves of Ilex centrochinensis Chemical constituents from the roots of Pithecellobium lucidum and their cytotoxic activity Simultaneous determination of 7-hydroxy-4′-methoxyflavane and pterostilbene in Zhuang Medicine Dracaena cochinchinensis by HPLC Chemical constituents of Acacia catechu Flavane constituents from branch of Celastrus hindsii