Abstract
Cross-reaction in allergic contact dermatitis (ACD) is a highly stereoselective process. The importance of the cis or trans ring junction in alpha-methylene-gamma-butyrolactones in cross-reactivity was investigated by reacting Helenin (mostly a mixture of natural allergenic sesquiterpene lactones alantolactone 1 and isoalantolactone 2, which present a cis ring junction) in guinea pigs sensitized to model allergenic alpha-methylene-gamma-butyrolactones: cis-bicyclic lactone 3 and trans-bicyclic lactone 4.
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