As part of our continuing studies on the Allium sulfides exhibiting antitumor effects, we identified several sulfides termed garlicnins and characterized their structures. They were classified into acyclic-, 3,4-dimethylthiolane-, 2-methylthiolane-, 1,2-dithiolane-, 2-oxothiolane-, and bis-thiolane-type sulfides. However, it was pointed out that some parts of 3,4-dimethylthiolane-type had structural inaccuracies. Therefore, we corrected them and determined the absolute configuration of the major sulfide, garlicnin B1, which is also the most abundant Allium sulfide and expected to possess antitumor effect.
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