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Six new tetracyclic quassinoids, picrajavanicins H–M, along with two known analogues were isolated from the CHCl3 soluble extract of Picrasma javanica bark collected in Myanmar. The structures of these compounds were elucidated using spectroscopic techniques, including 1D and 2D NMR. The absolute configuration at C-4 of picrajavanicin L was determined to be R by the modified Mosher method. In contrast,...
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