Chemical Constituents of Ligularia Species (Asteraceae) and Their Diversity in East Asia

Cumulative Data of 1H and 13C NMR Signals and Specific Rotations of Eremophilane Sesquiterpenoids. 1. Bicyclic Eremophilanes (1)

“…1 Reviews on natural products were recently published. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] It is quite obvious that spectroscopic data are very important to identify the compound; otherwise, we further need to measure 2D nuclear magnetic resonance (NMR), specific rotations, and other physiological data. Therefore, the data for known compounds are very important, but it is not always possible to find such data, because sometimes they are quite old and not enough data are presented.…”