[CH3:1][C:2]([CH3:26])([CH3:25])[C@H:3]([N:11]1[CH2:15][CH2:14][N:13]([CH2:16][C:17]2[CH:22]=[CH:21][CH:20]=[C:19]([CH3:23])[N:18]=2)[C:12]1=[O:24])[C:4]([O:6]C(C)(C)C)=[O:5].Cl>ClCCl.O1CCOCC1>[CH3:1][C:2]([CH3:26])([CH3:25])[C@H:3]([N:11]1[CH2:15][CH2:14][N:13]([CH2:16][C:17]2[CH:22]=[CH:21][CH:20]=[C:19]([CH3:23])[N:18]=2)[C:12]1=[O:24])[C:4]([OH:6])=[O:5]A solution containing the product from Example 10B (10 g, 27.7 mmol) in dichloromethane (100 ml) at −5° C. was slowly treated with an HCl solution in dioxane (200 mL, 4 N), stirred at 40° C. for 6 hrs, stirred at 25° C. for 16 hours concentrated to give the title compound as a hydrochloride salt (10 g, quantitative).
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