AnastrephinÂis a lactone component found in sexÂpheromone blend of male Caribbean and Mexican fruit flies. It is also anÂisomer of (E)-Hexahydro-(Z)-4,7a-dimethyl-4-vinylbenzofuran-2(3H)-one (H294720)Âthat can be used to synthesize of prolinol (an intermediate for insect pheromones).