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In this study, the new stable sulfur-containing compounds onionins A2 (1) and A3 (2) were isolated from the acetone extracts of the bulbs of Allium cepa L. and identified as the stereoisomers of onionin A1 discovered in our previous study. Their chemical structures, 3,4-dimethyl-5-(1E-propenyl)-tetrahydrothiophene-2-sulfenic acid-S-oxides, were characterized using various spectroscopic techniques. In addition, 1 and 2 together with onionin A1 were successfully isolated from the leaves of the Welsh onion, Allium fistulosum L. The onion-extracted fractions showed good potential to inhibit the polarization of M2 activated macrophages, indicating their possible ability to inhibit tumor cell proliferation.

chemical and pharmaceutical bulletin/chemical and pharmaceutical bulletin

Isolation and Characterization of New Onionins A&lt;sub&gt;2&lt;/sub&gt; and A&lt;sub&gt;3&lt;/sub&gt; from &lt;i&gt;Allium cepa&lt;/i&gt;, and of Onionins A&lt;sub&gt;1&lt;/sub&gt;, A&lt;sub&gt;2&lt;/sub&gt;, and A&lt;sub&gt;3&lt;/sub&gt; from &lt;i&gt;Allium fistulosum&lt;/i&gt;