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Glandular trichomes in form of long stretched tubes are present on the lower leaf side of Quercus robur as shown by scanning electron microscopy. The glands contain an essential oil, which was isolated by steam distillation together with volatile waxy components of the leaves in an amount of 0.025% of fresh leaves. The product of steam distillation was analyzed by GC-MS. Identification of com pounds is based on comparison of their mass spectral data with those of authentic samples in combination with retention indices and MS data using the SeKoMS (Search Kovats Indices and Mass Spectra) Library. Altogether 184 components of the product of steam distillation were separated, 155 of which could be identified, another 7 were tentatively assigned. Three groups of substances according to their chemical composition are found: hexenyl derivatives and some acetals (32%); terpenes including monoterpenes (4% ), sesquiterpenes and diterpenes (21%); and alkane derivatives (35%). The residual 8% consist of benzyl alcohol, com pounds which stem from the degradation of carotenes, and miscellaneous constituents

In the course of an investigation on the chemical constituents of Viburnum orientule Pallas (Caprifoliaceae), we reported recently an ester iridoid glycoside, viborientoside (1) and two acyclic monoterpene glycosides, anatoliosides A and B (2). As a result of our continuing work on the same plant, we now report the elucidation of the structures ofthree new acyclic monoterpene glycosides.The air-dried leaves of the plant (collected from N. F. Anatolia, Turkey) were extracted with MeOH. The water-soluble part of the methanol extract was partitioned with diethyl ether, EtOAc, and n-BuOH, successively. Repeated chromatographic separations of the n-butanol extract, using reversed OH OH H0 ,CH3 0 H2CHC o H3C H3C CH3

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