The syntheses of PhDPA-DiKTa and MeODPA-DiKTa are outlined in Scheme S1. Both compounds were obtained following a palladium-catalyzed Buchwald-Hartwig amination with brominated intermediate Br3DiKTa. The identity and purity of both compounds were verified by 1 H and 13 C nuclear magnetic resonance (NMR) spectroscopy, melting point determination, high-resolution mass spectrometry, elemental analyses, and high-performance liquid chromatography (HPLC) (Figures ).