[ClH:1].[CH3:2][C@@:3]([OH:35])([C:31]([CH3:34])([CH3:33])[CH3:32])[C@@H:4]1[C@:9]2([O:29][CH3:30])[C@@H:10]3[O:24][C:19]4=[C:20]([OH:23])[CH:21]=[CH:22][C:17]5=[C:18]4[C@:11]43[CH2:12][CH2:13][N:14]([CH2:25][CH:26]3[CH2:28][CH2:27]3)[C@H:15]([CH2:16]5)[C@@:6]4([CH2:7][CH2:8]2)[CH2:5]1>CC(C)=O>[CH3:2][C@@:3]([OH:35])([C:31]([CH3:34])([CH3:33])[CH3:32])[C@@H:4]1[C@:9]2([O:29][CH3:30])[C@@H:10]3[O:24][C:19]4=[C:20]([OH:23])[CH:21]=[CH:22][C:17]5=[C:18]4[C@:11]43[CH2:12][CH2:13][N:14]([CH2:25][CH:26]3[CH2:27][CH2:28]3)[C@H:15]([CH2:16]5)[C@@:6]4([CH2:7][CH2:8]2)[CH2:5]1.[ClH:1]Conc. HCl (2.6 L) was added to the filtered solution of buprenorphine base (9.65 Kg) in acetone (68 L) at below 15° C. to get pH below 2.0 and stirred for 1.0-2.0 hrs. The HCl salt firmed was filtered, washed with acetone and finally leached with filtered DM water (28 L) at 80° C. and dried. Yield=8.42 Kg.
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