[C:1]1([N:7]2[C:13]3[CH:14]=[C:15]([Cl:18])[CH:16]=[CH:17][C:12]=3[NH:11][C:10](=[O:19])[CH2:9][C:8]2=[O:20])[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.CO.[CH2:23]1[O:25][CH2:24]1.[OH-].C([N+](C)(C)C)C1C=CC=CC=1>O>[OH:25][CH2:24][CH2:23][N:11]1[C:12]2[CH:17]=[CH:16][C:15]([Cl:18])=[CH:14][C:13]=2[N:7]([C:1]2[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=2)[C:8](=[O:20])[CH2:9][C:10]1=[O:19]A mixture consisting of 28.6 gm (0.1 mol) of 5-phenyl-7-chloro-1H-1,5-benzodiazepine-2,4-(3H,5H)-dione, 500 ml of methanol, 25 ml of water, 10-15 ml of ethyleneoxide and 1 ml of Triton B (methanolic 35% solution of benzyl trimethylammonium hydroxide) was stirred at room temperature for about eight hours. Thereafter, the clear solution formed thereby was evaporated, the residue was taken up in methylene chloride, and the resulting solution was extracted with water, dried and evaporated. The residue was recrystallized from ethanol, yielding 25.6 gm (78% of theory) of the colorless crystalline compound of the formula ##SPC6##
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