Citral,  3, 7-dimethyl-2,6-octadienal. Citral is a pale yellow liquid with a strong lemon odour.   It is a constituent of oil of lemongrass.  Citral is also present to a limited extent in oils of verbena, lemon, and orange.  Citral is used in lemonade as for flavoring, as well as in perfumes and other flavorings.