Synthesis of Assigned Structure of Cairomycin A, 6-Isopropyl-2,5-Diketopiperazine-3-Acetic Acid and Its Β-Lactam Analogue N`- (3-Methyl-1-Hydroxybutyr-2-Yl) Azetidin-2-One-4-Carboximide. SJUOZ 2019, 7 (4), 144-151. https://doi.org/10.25271/sjuoz.2019.7.4.638.