This synthesis was adapted from a literature procedure. A solution of 4-pentafluorosulfanylaniline (150 mg, 0.67 mmol) in toluene (15 mL) was treated with triphosgene (135 mg, 0.44 mmol). Immediately, triethylamine (0.16 mL, 1.18 mmol) was added, and the reaction mixture stirred at 70 o C for 2 h. After this, pentane (1 mL) was added to elicit the formation of a white precipitate. This was filtered off and the pentane removed in vacuo to give 4-(pentafluorosulfanyl)phenyl isocyanate dissolved in toluene, which was used immediately in the next reaction. 1,9-Diaminoacridinone (50 mg, 0.22 mmol) was dissolved in DMSO (5 mL) and added to the reaction mixture. This was stirred for 3 h and, following this, the toluene was removed in vacuo. Next, the DMSO solution was poured into ice water (30 mL) to yield a light brown precipitate. This was washed with a small amount of 1:1 v/v ethyl acetate:hexane solution (5 mL) followed by copious amounts of 1:1 v/v diethyl ether:hexane solution to leave a dark brown solid, which was dried in vacuo (99 mg, 0.14 mmol, 63%). Mp = 259-262 °C (decomposition)