Enhanced Binding of Zn2+ Using a Sulfur Version of o-Aminophenol-Triacetate (APTRA): Introducing S-APTRA and Derivatives | Inorganic Chemistry pubs.acs.org/doi/10.1021/... Williams and co-workers @InorgChem #zinc #APTRA #sulfur #binding #calcium #magnesium #sulfoxide #tetradentate