Abstract
The crystal structure of ketotifen fumarate was determined. The crystal belongs to space group P1 and there are two molecules in an asymmetric unit. The cell dimensions are a = 10.0901(6), b = 11.7760(7), c = 18.8200(7)Å, α = 74.054(2), β = 81.034(3) and γ = 88.4315(7)°. The final R value is 0.068. The two crystallographically independent ketotifen molecules adopt very similar structures. Their tricyclic systems take a butterfly-shape structure.
