General Method A for Thiol Starting Material Synthesis (compounds 12, 14, 16, 17) To a heat-gun dried two-neck round bottom flask equipped with a stir bar was added the aryl halide (5.2 mmol, 1.0 equiv.) and thiourea (10.4 mmol, 2.0 equiv.). Subsequently, 12 mL of 200 proof EtOH was added. The reaction was stirred at reflux for 18 h. Then, aqueous sodium hydroxide (13.8mmol, 2.7 equiv.) was added and the reaction was allowed to reflux for an additional 2 h. After completion of the reaction, EtOH was removed under a stream of nitrogen. A 1.0 M HCl solution was added dropwise until precipitation of the yellow product ceased. The resulting solid was filtered and washed with H2O. The product was allowed to dry and was carried forward without further purification.