[BrH:1].[OH:2][C:3]1[C:12]([CH2:13][CH:14]=[CH2:15])=[C:11]([NH:16][C:17]([CH3:19])=[O:18])[CH:10]=[CH:9][C:4]=1[C:5]([O:7][CH3:8])=[O:6]>[Hg].O>[OH:2][C:3]1[C:12]([CH2:13][CH2:14][CH2:15][Br:1])=[C:11]([NH:16][C:17]([CH3:19])=[O:18])[CH:10]=[CH:9][C:4]=1[C:5]([O:7][CH3:8])=[O:6]2277 g of 66% hydrobromic acid and 308 g of methyl 2-hydroxy-3-allyl-4-acetaminobenzoate were introduced into a 3-liter round-bottomed flask equipped with a leakproof stirrer, a thermometer and a safety tube containing mercury so that a pressure of approximately 2 cm of mercury is created in the apparatus. The mixture was stirred for 4 hours and then allowed to stand overnight. 5 liters of water were then added. The precipitate formed was drained, washed with water and dried at 50° C.
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