Wikipedia definition
1. Allyl propyl disulfideAllyl propyl disulfide is an organic compound with the chemical formula C6H12S2. It is a pale-yellow liquid with a strong odor, it is a main ingredient in onion oil and used as food additives and flavors. This substance is present in garlic, onion, etc. , and is very easily evaporated. When onion or garlic is sliced, the substance evaporates and causes eyes to irritate. When garlic or onion is cooked, it also evaporates, ridding them of the spicy taste, and leaving sweet taste in them.
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