[CH:1]1([CH2:4][C:5]2[C:6]([OH:16])=[C:7]([CH:12]=[CH:13][C:14]=2[OH:15])[C:8](OC)=[O:9])[CH2:3][CH2:2]1.[Cl-].[NH4+:18]>>[CH:1]1([CH2:4][C:5]2[C:6]([OH:16])=[C:7]([CH:12]=[CH:13][C:14]=2[OH:15])[C:8]([NH2:18])=[O:9])[CH2:3][CH2:2]1The compound of Example 15 is heated at 50° C. in a saturated ammonium chloride solution overnight. The reaction mixture is thoroughly extracted with ethyl acetate, and the solvent dried (Na2SO4) and evaporated in vacuo to afford the crude product. Chromatographic purification or silica gel using ethyl acetate/hexane (4:6) as eluant affords the product.
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