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Two new triterpenoids, 3-oxotirucalla-7,9(11),24-trien-21-oic acid (1) and 18H?,3?,20?-ursanediol (2), along with 15 known triterpenes, ?-amyrin, ?-boswellic acid, ?-boswellic acid, acetyl ?-boswellic acid, acetyl ?-boswellic acid, 9,11-dehydro-?-boswellic acid, 9,11-dehydro-?-boswellic acid, acetyl 11?-methoxy-?-boswellic acid, 11-keto-?-boswellic acid, acetyl 11-keto-?-boswellic acid, acetyl ?-elemolic acid, 3?-hydroxytirucalla-8,24-dien-21-oic acid, elemonic acid, 3?-hydroxytirucalla-7,24-dien-21-oic acid, and 3?-hydroxytirucall-24-en-21-oic acid, were isolated from the resin of Boswellia carterii Birdw.
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