Dr. Dler Dlshad Kurda presented a seminar under the title ” Structure activity relationship, bioisosterism” on Sunday 8/12/2019 in Chemistry department / College of Education. At first, the presenter gave a brief introduction about bioisosterism and then he explained the benefits and the main use of this term and its techniques in pharmaceutical science. The presenter concentrated on the purpose of exchanging one bioisisteres for another in drug design to enhance the desired biological or physical properties of a compound without making significant changes in chemical structure.