+++thanks_alisanchem1_Article from tetrahedron

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1. Synthesis of (2RS,E)-3-Ethylidene-azetidine-2-carboxylic acid (rac. polyoximic acid) Original Research Article
Tetrahedron, Volume 48, Issue 35, 1992, Pages 7165-7172

DOI:

http://dx.doi.org/http://10.1016/S0040-4020(01)88257-0

link:

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http://www.sciencedirect.com/science/article/pii/S0040402001882570

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