Sesquiterpenes, limonoid and coumarin from the wood bark of Guarea guidonia.

Investigation of the wood bark of Guarea guidonia (Meliaceae) led to the isolation of a limonoid (mombasol), a coumarin (scopoletin), and six sesquiterpenes [trans-1(10)-epoxy-4(15)-caryophyllene, 1(10)-epoxy-4,7-humuladiene, viridiflorol, 1(10),4-diepoxy-7-humulene, 3-oxo-10-alloaromadendranol, 1beta-6alpha-dihydroxyeudesm-4(15)ene]. The occurrence of these metabolites in the Guarea genus is reported for the first time. Stigmasterol, sitosterol and its oleate and palmitate esters were also obtained. Some corrections to the previously reported chemical shift assignments of 3-oxo-10-alloaromadendranol ( (13)C-NMR) were made.