Olibanic acid is a pair of organic compounds with the formula . These are cyclopropane fatty acids. Although present at lower concentrations than other components, they have a highly potent odor and are thought to contribute the distinctive smell of frankincense. The (1S,2S)-(+)-trans and (1S,2R)-(+)-cis diastereomers have similar but nonidentical "old church"-like odors. Because of the cyclopropane ring, these compounds are conformationally constrained analogues of 2-methylundecanoic acid, a fragrance marketed under the name Mystikal.
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