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B 2663 (OTTO) 4-Bromophenylhydrazine hydrochloride, 99% Cas 622-88-8 - used as a reagent in the preparation of acylsulfonamides, acylsulfamides and 9-bromo-2-ethenyl-7,12-dihydroindolo[3,2-d]benzazepin-6(5H)-one.