Methyl 4-Fluoro-2-{1H-pyrrolo[2,3-b]pyridin-5-yloxy}benzoate is the intermediate for ABT 199 (A112430), which is a potent and selective BCL-2 inhibitor that achieves potent antitumor activity while sparing platelets. It’s practical application is to treat chronic lymphocytic leukaemic cells and estrogen receptor-positive breast cancer.