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The title chiral compound, C 23 H 28 NO + ·Br − , was obtained from an optically active amino­ethanol precursor. The pyrrolidine heterocycle has an envelope conformation, with the C atom α-positioned with respect to the keto group deviating by 0.570 (6) Å from the mean plane of other atoms. The  trans -fused seven-membered ring adopts a pseudo-chair conformation. The two phenyl rings form a dihedral angle of 85.1 (2)°. The cationic center and the bromide anion are connected through an N—H⋯Br hydrogen bond.

(1R,3R,3aS,8aR)-4-Oxo-3-phenyl-1-[(1R)-1-phenylethyl]decahydrocyclohepta[b]pyrrol-1-ium bromide