1) Vinca alkaloid 
Vinpocetine (brand names: Cavinton, Intelectol; chemical name: ethyl apovincaminate) is a semisynthetic derivative of the vinca alkaloid vincamine (sometimes described as `a synthetic ethyl ester of apovincamine`), an extract from the lesser periwinkle plant. Vinpocetine was first isolated from the plant in 1975 by the Hungarian chemist Csaba Sz.....