The title compound, C₂₂H₂₂NO₃P, crystallizes in space group P2₁, with a=13.219 (8), b=10.536 (7), c=7.143 (4) A, β=94.87 (6), and Z=2. The structure was solved by the direct method and refined to an R value of 0.0353. A unique structure having a cyclobutane ring fused with a furanoside moiety, and a diphenylphosphine group at the ring juncture, was confirmed by the analysis. A 270 MHz proton nuclear magnetic resonance (¹H-NMR) analysis of the compound showed interesting coupling features of the cyclobutane ring protons and phosphorus.