A mixture of Compound 9 (42.2 g, 0.13M), prepared in Example 9, and N-(3-bromopropyl)phthalimide (35 g, 0.13M) were dissolved in DMF (300 ml). Cesium carbonate (100 g, 0.3M) was added in one portion and the resulting heterogenous mixture heated in an 80° C. oil bath for 16 hours. The mixture was cooled to room temperature and the DMF removed under reduced pressure. The residue was poured into ice water (800 ml) and stirred at room temperature overnight. The white solid precipitates were collected and dried to give the desired product (60 g, 92%). The BOC group was removed by treatment of a solution of the compound in methylene chloride (500 ml) with excess trifluoroacetic acid (46 ml, 0.6M). The mixture was stirred at room temperature overnight and evaporated to dryness under reduced pressure. The resulting white solids were washed with diethyl ether and dried to give the desired TFA salt. m.p. 173-175° C. 1H NMR (300 MHz, DMSO-d6) δ8.79 (m, 1H; 8.54 (m, 1H); 7.82 (s, 4H); 7.35 (m, 1H); 7.25 (m, 1H); 7.07-6.90 (m, 2H); 4.55 (m, 1H); 3.90 (t, J=7 Hz, 2H); 3.63 (t, J=7 Hz, 2H); 3.42 (m, 2H); 3.15 (m, 2H); 2.60(m, 2H); 2.07 (m, 2H); 1.90 (m, 2H). MS: m/z (MH+) 405
