All students in the organic chemistry class are assigned a unique set of nine molecules to report on as optional extra credit assignments. The molecules are taken from a list containing over 200 molecules on the class Web site; they represent an assortment of biologically relevant compounds, from acetaminophen to yohimbine. Once a week, students may submit information about one of the molecules for two points extra credit (where the course includes a total of over 600 points from traditional quizzes and exams). The information requested about the molecules varies slightly each term as student expertise grows, for example, molecular formula, hybridizations, functional groups, or number of stereocenters, but always includes biological relevance and sources of information. Initially students submitted data directly to the instructor by e-mail, but submissions now are handled by a Web-based course management system (WebCT). The goal is to give students individualized assignments that are relatively realistic in light of their future careers in health sciences. Nearly all of the students do some of the molecules, and many students do all of them. About 30–40% of the students who do the assignments regularly gain a grade benefit. Student responses to the exercise have been positive.