FC(F)(F)C([NH:5][C@@H:6]1[C:15]2[C:10](=[CH:11][CH:12]=[CH:13][CH:14]=2)[C@@H:9]([OH:16])[CH2:8][CH2:7]1)=O.[OH-].[Na+]>CO.O.C(Cl)Cl>[NH2:5][C@@H:6]1[C:15]2[C:10](=[CH:11][CH:12]=[CH:13][CH:14]=2)[C@@H:9]([OH:16])[CH2:8][CH2:7]1To a grey solution of Intermediate 5a (5.55 g, 21.4 mmol) in MeOH (50 mL), NaOH (1.28 g, 32.1 mmol) in water (15 mL) was added, and the mixture stirred at room temperature for 3 days. NaOH (1.28 g, 32.1 mmol) was further added and the brown solution was stirred for 5 h. The solution was applied directly to an SCX-2 column, washing with MeOH and eluting with 2M NH3 in MeOH, and concentrated under vacuum to leave a grey solid. The solid was suspended in DCM (50 mL) with sonication, then filtered and dried under vacuum to leave a pale grey solid (2.93 g, 84%). 1H NMR (400 MHz, d6-DMSO): 1.41-1.64 (2H, m), 2.02-2.13 (2H, m), 3.82 (1H, dd), 4.55 (1H, dd), 5.08 (1H, br s), 7.13-7.22 (2H, m), 7.35-7.49 (2H, m).
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