A new phytoecdysteroid. viz., 2-deoxy-3-epi-4 beta ,20-dihydroxyecdysone ((
20R,22R)-3 alpha ,4 beta ,14 alpha ,20,22,25-hexahydroxy-5 beta -cholest-7-
en-6-one). named coronatasterone, was isolated from Serratula coronata and
identified by NMR spectroscopy.