Figure 3From: Pesticidal and pest repellency activities of rhizomes of Drynaria quercifolia (J. Smith) against Tribolium castaneum (Herbst)Structure of compound 1 (3, 4-dihydroxy benzoic acid). The compound has three functional groups. Two hydroxyl groups at 3 and 4 positions and one carboxyl group at 1 position.Back to article page