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Pyrus pyrifolia (Burm.) Nak. - syn.Pyrus serotina Rehder - Rosaceae
nashi, China pear, Asian pear, Nashi-Bine, China-Birne

„Along with cultivars of P. × bretschneideri and P. ussuriensis, the fruit is also called the nashi pear.“
http://en.wikipedia.org/wiki/Pyrus_pyrifolia

„The volatile constituents of Asian pear were isolated using vacuum steam distillation-extraction (vacuumSDE) and dynamic headspace sampling of intact and blended fruit. The samples were analyzed by high-resolution gas chromatographyand combined gas chromatography/mass spectrometry (GC/MS)… Odor unit values calculated from concentration and odor threshold data indicate that the following compounds are important contributors to pear aroma: ethyl 2-methylbutanoate, ethyl hexanoate, ethyl butanoate, ethyl 2-methylpropanoate, hexyl acetate, ethyl heptanoate, hexanal, ethyl pentanoate, and ethyl propanoate… Analysie of fresh pear extract obtained by vacuum SDE revealed that ethyl 2-methyl-butanoate occurred in exclusively the S(+) configuration. Earlier studies had shown that this important ester is also present in exclusively the S(+) configuration in pineapple (Takeoka et al., 1990) and predominantly in the S(+) configuration in Granny Smith apples (Mosandl et al., 1991).“
[ Volatile constituents of Asian pear (Pyrus serotina)., Takeoka, G. R., Buttery, R. G., Flath, R. A., Journal of Agricultural and Food Chemistry, Vol.40(10), 1992, 1925-1929]