In this study, several novelβ-carbolinederivatives, 1-(4-hydroxy-3-methoxyphenyl)-β-carboline-3-carboxyl-Trp-Trp-AA-OBzl compounds, were designed and synthesized as potential anticancer agents. Their in vitro cytotoxic activities were evaluated using methylthiazoltetrazolium (MTT) assay. The in vivo anti-tumor activity of the newly synthesized β-carbolinederivatives was determined in a S180 bearing