 There she proposed the novel idea of using an asymmetric catalyst to control chemical bond formation across large, cyclic molecules to form the favored stereoisomer.She then made the switch from organic chemistry to chemical biology as she pursued a postdoctoral fellowship from 2008 through 2011 at Harvard Medical School with natural products researcher Christopher Walsh.Together they collaborated on the biosynthesis of scytonemin, a "microbial sunscreen" used to protect microorganisms from harmful UV light.