Bosutinib is a small molecule bcr-abl and src tyrosine kinase inhibitor used for the treatment of chronic myelogenous leukemia. Originally synthesized by wyeth, it is being developed by pfizer bosutinib is a small molecule bcr-abl and src tyrosine kinase inhibitor used for the treatment of chronic myelogenous leukemia. Originally synthesized by wyeth, it is being developed by pfizer