Isolation and structure elucidation of neokadsuranic acid A, the first triterpenoid with the 14(13 - 12)abeo-lanostane skeleton, and (24Z)-3-oxo-lanosta-8,24-dien-26-oic acid - Kunio,K.; Toshio,M.; Akira,K.; Akiko,I.; Taku,M.; Sudafumi,O. (Planta Med, 1989)