Chemical composition and biological evaluation of the essential oil of the flowering aerial parts of Ledeb.

Ledeb () is a plant known for its fragrant smell and has been traditionally used to treat influenza. However, despite its widespread use, there is no research on its flowering aerial parts. This study aims to contribute to the understanding the flowering aerial parts by investigating its volatile oil.

Determination of a new chromone from Aurantii Fructus Immaturus by DFT/GIAO method.

Investigation of EtOAc fraction from the 95% ethanol extract of Aurantii Fructus Immaturus led to the isolation of one new chromone (1) and seven known flavonoids (2-8). Their structures were elucidated mainly by NMR and HR-ESI-MS, as well as on comparison with the reported NMR data. The final substituent pattern of 1 was defined by comparison of (13)C NMR data calculated by DFT/GIAO with those of experimental NMR data.