Chk1-IN-6 is a selective and orally active Chk1 inhibitor with an IC50 of 16.1 nM. Chk1-IN-6 shows antiproliferative activity of MV-4-11 cells. Chk1-IN-6 exerts effective response in the MV-4-11 xenograft mouse model. Chk1-IN-6 exhibits synergistic anticancer effect with Gemcitabine. Chk1-IN-6 can be used in the research of cancers such as acute myeloid leukemia and colorectal adenocarcinoma[1].