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We obtain the global well-posedness and the scattering theory of the solution for the modified Davey–Stewartson system { i ∂ t u + Δ u = | u | 4 u + u v x 1 , (t , x) ∈ R × R 3 , − Δ v = (| u | 2) x 1 in the energy space H 1 ( R 3) in this paper. Since the interaction Morawetz estimate fails and the nonlinearity is non-local, we employ the concentration-compactness argument introduced by Kenig and Merle (Invent Math. 2006;166:645–675) to establish the scattering result. [ABSTRACT FROM AUTHOR]