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Allicin is found in garden onion. Allicin is isolated from garlic (Allium sativum). Nutriceutical Allicin is an organic compound obtained from garlic. It is also obtainable from onions, and other species in the family Alliaceae. It was first isolated and studied in the laboratory by Chester J. Cavallito in 1944. This colourless liquid has a distinctively pungent smell. This compound exhibits antibacterial and anti-fungal properties. Allicin is garlic's defence mechanism against attacks by pests

S-2-Propenyl 1-propenesulfinothioate is found in onion-family vegetables. S-2-Propenyl 1-propenesulfinothioate is a constituent of Allium species.

S-1-Propenyl 2-propenesulfinothioate is found in onion-family vegetables. S-1-Propenyl 2-propenesulfinothioate is a constituent of Allium species.

R-2-Propenyl 1-propenesulfinothioate is found in onion-family vegetables. R-2-Propenyl 1-propenesulfinothioate is a constituent of Allium species.

R-1-Propenyl 2-propenesulfinothioate is found in onion-family vegetables. R-1-Propenyl 2-propenesulfinothioate is a constituent of Allium species.

Zwiebelane A is found in onion-family vegetables. Zwiebelane A is a constituent of onion (Allium cepa).