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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 D. Kumar Tiwari, Shaikh, A. Y., Pavase, L. S., Gumaste, V. K., and Deshmukh, A. Rakeeb A., ?Stereoselective synthesis of 3-alkylidene/alkylazetidin-2-ones from azetidin-2,3-diones?, Tetrahedron, vol. 63, no. 11, pp. 2524-2534, 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 V. Sunder Avinash, Pundle, A. Vishnu, Ramasamy, S., and Suresh, C. Gopalan, ?Penicillin acylases revisited: importance beyond their industrial utility?, Critical Reviews In Biotechnology, vol. 36, no. 2, pp. 303-316, 2016.\par \par }