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(organic chemistry)
Any terpene with the formula C15H24; that is, 1½ times the terpene formula.



any of the hydrocarbons with the general formula C15H24 (trimers of isoprene) or oxygen derivatives of these hydrocarbons. The name “sesquiterpenes” indicates that the molecular weight of these compounds is 1.5 times greater than that of the monoterpenes (from the Latin sesqui, “one and one-half times”). Sesquiterpenes, like terpenes, occur in essential oils and balsams and account for the characteristic odors of plants.

References in periodicals archive ?
Based on the results of the phytochemical screening, in red betle leaf extract contained several classes of compounds such as saponins, polyphenols, quinones, tannins, steroids, monoterpenoid, sesquiterpenoids, and flavonoids.
The sesquiterpenoids caryophyllene (c18), viridiflorol (c24) and spathulenol (c22), together with the non-identified compounds NI6 (c25) and NI5 (c17), provided a small contribution to PC 1 and 2 (see Figure 1).
Malvaceae: The first sesquiterpenoids discovered to be nematotoxic were the aldehydes hemigossypol and 6-methoxyhemigossypol, in addition the dimmers gossypol, and 6-methoxygossypol.
Our results demonstrate that monoterpenoids (linalool) as well as sesquiterpenoids ([beta]-caryophyllene) may serve as an antifeedant against herbivorous insects.
Biologically active sesquiterpenoid metabolites from the fungus Botrytis cinerea.
At least eight different sesquiterpenoid compounds including sesquiterpene aldehydes (Paul et al.
The active ingredient in gyrinidal is a sesquiterpenoid aldehyde (Miller et al.
nigra) were tested for the presence of alkaloid, steroid/triterpenoid, saponin, polifenol, tanin, flavonoid, kuinon, monoterpenoid, and sesquiterpenoid.
In contrast, the sesquiterpenoid (-)-germacrene-D is present in the leaf and trunk volatiles of the host of M.
Known terpenoids from lichens are all shared with higher plants or marine organisms, including monoterpenoid (-)-carvone 45, sesquiterpenoid bakkenolide A/fukinanolide A 46 from Cetraria islandica (Solberg 1986), triterpenoids [alpha]-amyrin 47, friedelan-3[beta]-ol/epifriedelinol 48, lupeol 49 and ursolic acid 50 from Flavocetraria nivalis (Bruun 1969) and zeorin 51 in the Vulpicida genus (Randlane et al.
cordifolia composed of difference active compounds, for example, alkaloids, diterpenoid lactones, glycosides, steroids, sesquiterpenoid, aliphatic (36,37).