Antibacterial Activities of Neolignans Isolated from the Seed Endotheliums of Trewia nudiflora TISSUE CULTURE OF TREWIA NUDIFLORA MAYTANSINOIDS FROM THE SEEDS OF TREWIA NUDIFLORA Structural Determination of Fatty Acid Components in the Seed Oils of Five Species of Euphorbiaceae ANTIFEEDANT EFFECT OF MAYTANSINOIDS FROM THE SEEDS OF TREWIA NUDIFLORA ON INSECT PESTS Studies on chemical constituents from stem bark of Trewia nudiflora