[C:1]([NH:4][C:5]([C:13]1[CH:18]=[CH:17][CH:16]=[CH:15][CH:14]=1)=[C:6]([CH3:12])[C:7]([O:9]CC)=[O:8])(=[O:3])[CH3:2].[OH-].[Na+].O.Cl>C(O)(C)C>[C:1]([NH:4][C:5]([C:13]1[CH:14]=[CH:15][CH:16]=[CH:17][CH:18]=1)=[C:6]([CH3:12])[C:7]([OH:9])=[O:8])(=[O:3])[CH3:2]80 g of the product of Step A were stirred for 5 hours in 400 ml of isopropanol and 48.5 ml of sodium hydroxide and the solution was poured into a liter of water taken to pH 1 with concentrated hydrochloric acid. The precipitate was separated, washed with water and dried under reduced pressure to obtain 42 g of the expected product melting at 190° C.
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