M. Bathori et al., ISOLATION AND STRUCTURAL ELUCIDATION OF 2 PLANT ECDYSTEROIDS, GERARDIASTERONE AND 22-EPI-20-HYDROXYECDYSONE, Journal of natural products, 61(3), 1998, pp. 415-417
Two minor plant ecdysteroids, 22-epi-20-hydroxyecdysone (1) and gerard
iasterone (2), were isolated from Serratula tinctoria L. (Compositae).
The first compound, a new natural product, was characterized by an un
usual stereochemistry at C-22 (i.e., 22S). The second compound was ide
ntified as (20R,23S)-20,23-dihydroxyecdysone, a compound previously is
olated from the Zooanthid Gerardia savaglia.