Studies on the mass spectrometry of natural products VI: Mass spectra of 20-C-nonoxygenated-ent-kaurenes
ZHAO FANZHI;LI HONG;CHEN NENGYU;CHEN YAOZU;HUA SUMING;SUN HANDONG;LIN ZHONGWEN;XU YUNLONG
Acta Chimica Sinica . 1989, (7): 656 -661 .