Abstract
Several compounds are important metabolites that contribute to the defense of plants against the attack of phytopathogens and insects. Many of these are hemiterpenes, containing C5 prenyl groups attached to the carbon atoms of heterocyclic systems, and they presented as phytoalexins or phytoanticipins associated with resistance to pathogens of citrus such as Phytophthora citrophthora, Xyl…