ASSIGNMENT OF THE 1H AND 13C NMR SPECTRA OF BETULINIC ACID 7',8'-DIHYDROXYCINNAMATE
Wang Taotao, Lu Jingfen, Zhang Lihe, Wang Hanqing, Wei Xiaoyi, Li Jiangang, Wei Biyu
Chinese Journal of Magnetic Resonance . 1996, (4): 333 -339 .