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A. S.  Kale, Sakle, P. S., Gumaste, V. K., and Deshmukh, A. Rakeeb A., ?4-Formylazetidin-2-one as a useful building block for the formal synthesis of xylo-(2S,3R,4R)-phytosphingosine and threo-(2S,3S)-sphingosine?, Synthesis-Stuttgart , vol. 17, pp. 2631-2636, 2007.\par \par G.  Pandey and Tiwari, D. Kumar, ?Enantioselective total synthesis of (2S,3R,4R)-D-xylo-phytosphingosine from substituted azetidin-2-one?, Tetrahedron Letters, vol. 50, no. 26, pp. 3296-3298, 2009.\par \par A.  El-Dahshan, Al-Gharabli, S. I., Radetzki, S., Al-Tel, T. H., Kumar, P., and Rademann, J., ?Flexible, polymer-supported synthesis of sphingosine derivatives provides ceramides with enhanced biological activity?, Bioorganic & Medicinal Chemistry, vol. 22, no. 19, pp. 5506-5512, 2014.\par \par }