Four New Pregnane-10,2-carbolactones from an <i>Epipolasis</i> sp. Marine Sponge

Marine natural products

“…New pregnane sterols 1133–1136 were reported from a Palauan Epipolasis . 465 Other sterols were obtained from Dysidea 1137–1144 , Xestospongia 1145 , Halichondria 1146–1148 , and Echinoclathria 1149 sponges, 465–469 while a new theonellasterol 1150 extends the membership of the 4-methylidene class of sterol commonly found from genus Theonella . 470 An unusual spiro-sterol 1151 was also reported.…”