A 50-mL round-bottomed flask equipped with a Teflon-coated magnetic stir bar containing RAE (5.8 mg, 0.023 mmol) was treated with EtOH (10.0 mL), DMSO (0.60 mL), water (2.0 mL), and 16 M NaOH (25 μL). Dark red reaction mixture turned dark purple. EtOH was removed in vacuo, then the resulting mixture was neutralized with 1 M HCl to pH 7. Dark purple reaction mixture turned dark red. The mixture was extracted with CH2Cl2 ( ´ 10 mL). The combined organic layers were dried over Na2SO4, filtered, and concentrated in vacuo to afford dark red solid.